# Ojas and the Ayurvedic Account of Resistance to Disease > Canonical version of this page: https://nighantu.ageayurveda.com/concept/ojas-and-immunity/ ## How much weight this concept bears This is the clearest case in the cluster of a concept resting on classical exegesis with a modern literature that proposes rather than demonstrates. Within what this record retrieved there is no assay for ojas, no reference range, no validated clinical instrument, and no study in which anything called ojas was measured before and after an intervention. A PubMed query for ojas in title or abstract restricted to clinical trial or randomised controlled trial publication types returned nothing on 2026-10-06, which is the search that licenses that sentence. On biochemical identification the record previously said that two proposals exist. That was a census a bounded search cannot support, and it was also wrong. Three are now retrieved: steroids and steroid classes in 1995 (PMID 7705867), kapha read as the degree of gene expression and "correlated with the ojas of the body or total body defence mechanism" in 2000 (PMID 11272402), and cholesterol with HDL-C as surrogate for healthy apara ojas in 2025 (PMID 41289791). All three are hypothesis or review papers whose authors say so, and none has been followed by a validation study in what was retrieved here. The searches run were: ojas in title; ojas in title or abstract with biomarker, biochemical or immunity; ojas with ayurveda; ojas with immunoglobulin, glycoprotein, albumin or albumen; ojas with thermodynamic, entropy or agni; and author searches on Hankey and on Patwardhan. The critic expected a Hankey thermodynamic account of agni and ojas and Patwardhan immunity-concept papers to turn up; the Hankey author query with ojas or agni in title or abstract returned nothing, and the Patwardhan immunity results retrieved are botanical immunomodulation studies rather than identifications of ojas. An immunoglobulin or glycoprotein reading was searched for by name and not retrieved. That is a statement about these searches and not about the world; a different search, and in particular one outside PubMed and into Ayurvedic journals that PubMed does not index, could find more. Bhishagratna's "albumen" is deliberately not counted among those proposals. It is a translator's gloss carried silently through his whole rendering of Sushruta Sutrasthana 15, and his own footnote says the term is used "primarily" for protoplasmic matter in cells and "secondarily" for albumen. Counting it as a biochemical identification would be absorbing the translator's voice as doctrine, which this project has had to correct three times already. It is recorded as a position in contested, attributed to the translator. Beyond the proposals, the indexed literature retrieved here consists largely of narrative reviews that restate the classical doctrine in immunological vocabulary and stop. The quantitatively strongest item located, the Chyawanprash prophylaxis meta-analysis (PMID 39544586), is null on every efficacy endpoint with severe heterogeneity, and tests a formulation rather than the construct. The post-2020 Ayurvedic COVID literature was searched as the critic asked, and it changes the shape of the gap rather than closing it. Immune parameters were measured: a randomised placebo-controlled pilot trial quantified IL-6, TNF-alpha and hs-CRP (PMID 33596494), and a multicentric randomised AYUSH-64 trial reported faster clinical recovery (PMID 36928877) while a second AYUSH-64 randomised trial reported no difference in RT-PCR conversion (PMID 34908795). In none of them was ojas the exposure, an outcome, or measured at all. So the honest statement is not that nobody has measured immunity under an ojas-framed intervention, it is that nobody has measured ojas alongside the immunity, which leaves the identification exactly where it was. One retrieved paper does operationalise a mode of ojas derangement: a prospective DMD cohort scored ojovisramsa as a staging variable and found it differed significantly between ambulation stages (PMID 42161239), with no reliability data. Compounding all of this, the classical sources do not agree on what ojas is. Charaka's Sutrasthana 17 calls it a slightly yellowish pure blood in the heart at the aphorism Kaviratna prints as 74 and identifies it with normal phlegm at 114, while Sushruta calls it the quintessence of all seven dhatus and Bhishagratna's own footnote records authorities who deny that ojas and vitality are identical at all. Kaviratna's footnote to the anjali list in Sharirasthana 7 adds a fourth layer: a variant reading that makes ojas a kind of phlegm, which Gangadhara's commentary adopted and which Kaviratna rejects by declaring, in his own voice, that ojas is "the blood of blood". A construct whose primary sources define it several incompatible ways cannot be operationalised until that is resolved, and no modern paper retrieved here resolves it. One thing the record previously got wrong in the other direction is worth stating plainly. It reported that the half-anjali quantity of ojas could not be found in either public-domain translation. It is there, in Charaka Sharirasthana 7, and it is now quoted. What is still unlocated is the para/apara vocabulary and the eight-drop figure. So the quantities are not all commentarial; one of them is scriptural and the division they are usually hung on may not be. The correct overall statement is that ojas is a rich and internally detailed classical account of vitality and resistance, that its identification with immunity is an interpretive overlay rather than a finding, and that no operational definition of it has been validated in anything this record retrieved. Ojas is described in the classical texts as the refined essence distilled from all seven bodily tissues, seated principally in the heart, pervading the body, and responsible for strength (bala), steadiness of the sense organs, complexion, voice and the capacity to withstand disease (vyadhikshamatva). Its depletion is said to produce fearfulness, weakness, emaciation, loss of lustre and, at the extreme, death. Three modes of derangement are distinguished: displacement from its seat (visramsa), corruption by vitiated humours (vyapat) and wasting (kshaya), and Sushruta supplies a sign list and a prognosis for each. The concept is the usual point of contact between Ayurveda and modern immunology, but the correspondence is an interpretive one: ojas as described covers reproduction, morphogenesis, mood and vitality as well as resistance to illness, and the classical sources do not agree among themselves on what ojas actually is. In Kaviratna's wording Charaka calls it, in one aphorism of Sutrasthana 17, a quantity of pure blood "which is slightly yellowish" residing in the heart, and forty aphorisms later identifies it with normal phlegm, while Sushruta calls it the quintessence of all the dhatus. The reddish-yellow description that circulates widely is Vagbhata's and is recorded here under Vagbhata, not under Charaka. This record makes no claim about how much modern evidence exists for or against the identification with immunity; it states what the searches named in gatheringNotes returned. ## At a glance | Field | Value | | --- | --- | | Subject area | How the body is held to work | | Domain, as recorded | Ayurvedic physiology and immunology comparison | | Contested questions | 5 | | Stated as not known | 14 | | Classical citations | 18, 16 quoting the text | | Research papers assessed | 11 | | Citations checked | 2026-10-08 | ## What is contested, and by whom These are the questions on which the sources genuinely disagree. Each position is given as its source states it. No position is presented as the settled answer, because none of them is. ### What is ojas, materially? This is contested. - Sushruta Sutrasthana 15: the quintessence of all seven dhatus from rasa to shukra, identical with vital power. - Charaka Sutrasthana 17, at the aphorism Kaviratna prints as 74: a quantity of pure, slightly yellowish blood residing in the heart. - Charaka Sutrasthana 17, at the aphorism Kaviratna prints as 114: normal phlegm (kapha) itself. Three aphorisms earlier the same chapter says "The phlegm that is normal is called strength of the body", which is how this identification reaches bala. - A fourth position recorded in Bhishagratna's note to Sutrasthana 14: certain authorities hold ojas to be the eighth and culminating dhatu, produced from the thin fraction of shukra. - A fifth, recorded in Bhishagratna's footnote to Sutrasthana 15: 'Several authorities hold a contrary view stating that Ojas (albumen) forms only one of the essentials of vitality and that the two are by no means identical.' - A sixth, and it is the translator rather than the text: Bhishagratna renders ojas throughout as "albumen", and his footnote to Sutrasthana 15 says the term means "primarily ... protoplasmic matter as found in cells (Vindus)" and "secondarily ... albumen". This is a nineteenth-century biochemical reading embedded in the translation itself. It is listed here as a position held by the translator, and it is excluded from any count of proposals in the indexed modern literature for that reason. - A seventh, textual rather than doctrinal: Kaviratna's footnote to the anjali list in Sharirasthana 7 reports a variant reading of the ojas line which Gangadhara read as "the particular kind of phlegm known as ojas", so the kapha identification has manuscript support outside Sutrasthana 17. Kaviratna rejects it and asserts in his own voice that ojas is "the blood of blood, the most vital dhatu in the body", which is the translator settling a question the text leaves open. ### Is there a para/apara division, and what are the quantities? This is contested. - The standard modern teaching distinguishes para ojas (a very small fixed quantity in the heart, commonly given as eight drops) from apara ojas (a larger circulating quantity, commonly given as half an anjali), and the 2025 biomarker paper builds directly on this division. - On the quantities the record's earlier negative result was half wrong and is corrected here. The half-anjali measure IS in the retrieved public-domain Kaviratna, in Charaka Sharirasthana 7, where the anjali list gives marrow one anjali, brain half an anjali, and semen and ojas "the same (as above)". So that figure is scriptural. Charaka introduces the list as known by inference rather than direct perception, and Kaviratna's footnote to the ojas line records a variant reading at exactly that point, so it is a disputed line even within the edition that carries it. - The eight-drop figure was searched for again on 2026-10-06 in both full texts and not located. Neither was the para or apara vocabulary as applied to ojas: the only Para and Apara in Kaviratna are the Nyaya categories Paratwa and Aparatwa in Sutrasthana 25, which are about priority and inferiority of place, season and age, not about two kinds of ojas. - So the honest position is that one of the two quantities is scriptural, the other is not located, and the two-kinds division that organises them is not attested in either translation searched. Whether the division is commentarial, or later, or simply a modern teaching convenience, this record does not establish. ### What is the modern correlate of ojas, if any? This is contested. - Steroids and steroid classes (Walton and Pugh 1995, PMID 7705867). - Kapha read as the degree of gene expression as protein synthesis, "correlated with the ojas of the body or total body defence mechanism" (Mishra and colleagues 2000, PMID 11272402). - Cholesterol and its products, with HDL-C as surrogate for healthy apara ojas (Sumantran and Nair 2025, PMID 41289791). - General immune competence, immunoglobulins or innate immunity, the commonest framing in clinical and popular Ayurvedic writing. A search for an immunoglobulin or glycoprotein identification by name retrieved none, so the framing is widespread in practice and not argued for in what was retrieved from the indexed literature. - That there is no single correlate, because ojas as described spans reproduction, foetal morphogenesis, mood, strength and resistance, and no one molecule does all of that. ### Is ojas equivalent to immunity at all? This is contested. - The equivalence is assumed in most clinical writing and in public health messaging, and vyadhikshamatva is routinely translated as 'immunity'. PMID 26195903 is a clean specimen: its authors gloss ojas as "immune strength" in the conclusion of a trial that measured blood sugar. - Against this: the classical functions of ojas include conception, foetal development, complexion, voice, sensory and intellectual function and courage, most of which have no immunological content, while the immune system's central features (specificity, memory, self and non-self discrimination) have no classical counterpart under ojas. - A separate point, raised by the Charaka Sutrasthana 28 passage added: the clearest classical statement about differential resistance to disease does not mention ojas at all. It makes resistance a function of the adequacy of flesh, blood and bone, of strength, and of the measure of food. If that is where the corpus locates vyadhikshamatva, then ojas and vyadhikshamatva are related but not identical even inside the classical frame, and the modern habit of treating the two terms as one may be importing a unity the texts do not assert. ### Is ojo-kshaya at its extreme truly incurable? This is contested. - Sushruta states it directly, and the sentence before it states the converse: visramsa and vyapat are to be treated by "elixirs and remedies possessed of rejuvenating properties", while a patient who has lost consciousness from excessive ojas waste is to be given up by the physician. Both sentences are now quoted in full. - This has never been tested in anything retrieved here, and as a prognostic claim it is unfalsifiable as stated, since the diagnosis of terminal ojo-kshaya is itself made from the moribund state it is meant to predict. ## What is not known Stated rather than left out. Where a negative has actually been searched for rather than assumed, the entry says so. - No assay for ojas was located, so none of the three published proposals for a molecular correlate (PMIDs 7705867, 11272402, 41289791) can be checked against the thing it claims to mark. - No reference range or normal value is defined for any candidate ojas marker in an ojas frame. - Ojo-visramsa, ojo-vyapat and ojo-kshaya have sign lists in Sushruta Sutrasthana 15, now quoted, but no case definition another team could apply, and no interrater reliability data was located. The flat statement in the previous version of this record, that they have no operational criteria and no reported prevalence in any population, was too strong: PMID 42161239 scored ojovisramsa in a 67-participant DMD cohort and reported it differing significantly between ambulation stages. What remains unknown is whether that scoring is reproducible, whether it transfers outside a rare neuromuscular disease, and what prevalence any of the three modes has in a general population. - No study has shown that any intervention changes a putative ojas marker in parallel with a clinical outcome; the 1995 and 2025 proposals are both untested. - The para/apara distinction is not established from the public-domain translations. The half-anjali quantity IS, for ojas without qualification, at Charaka Sharirasthana 7, which corrects this record's earlier negative result. The eight-drop quantity was searched for again and not located, and neither was any para or apara vocabulary applied to ojas. Whether the division itself is commentarial, later, or a modern teaching convenience is not resolved by any source retrieved here. - Whether the three incompatible classical definitions describe one thing, three things, or a term that shifted meaning across recensions is not resolved by any source I found. - The claim that ojas passes between mother and foetus in the eighth month has no identified referent and has never been investigated. - What the clinician is actually judging when assessing ojas at the bedside - and whether two clinicians judge it the same way - has not been measured. - Whether Ashtanga Hridaya Sutrasthana 11 is a parallel locus for the three derangement modes, and at which verses, is not established. There is no public-domain English translation of the Ashtanga Hridaya, no Sanskrit text of it was retrieved, and the verse range 37-40 that circulates in secondary sources is unverified. The sign lists this record carries are sourced to Sushruta Sutrasthana 15, which was retrieved and quoted, so nothing in the record now depends on the Vagbhata locus; whether Vagbhata says the same thing is simply not covered here. - Whether the aphorism numbers Kaviratna prints for the passages used here (Sutrasthana 11 at 31, Sutrasthana 17 at 74 and 114, Sutrasthana 28 at 13, Sutrasthana 30 at 6-10, Sharirasthana 4 at 31) correspond to the standard Trikamji numbers is not established. The off-by-one offset documented for this translation was established for Chikitsasthana 15 and Vimanasthana 5 and 8, and has not been checked for these chapters, so no standard-edition number is asserted for any of them. - Why Kaviratna's printed aphorism number for the eighth-month ojas passage (31) differs from the number the Sanskrit source used in this record gives for what appears to be the same passage (Sharirasthana 4.24) is not resolved. The two numbering systems have not been reconciled. - No study was located in which ojas was measured alongside an immune parameter. Immune parameters have been measured under Ayurvedic interventions (IL-6, TNF-alpha and hs-CRP in PMID 33596494), and clinical outcomes under AYUSH-64 (PMIDs 36928877, 34908795), but in none of the retrieved studies was ojas an exposure, an outcome, or measured. The question the previous version of this record asked, whether ojas status correlates with any measured immune parameter, therefore remains open because the studies that measure the second thing do not measure the first. - Whether the identification of ojas with vyadhikshamatva is supported by the corpus at all is not settled here. The clearest classical statement on differential disease resistance located in this gathering (Charaka Sutrasthana 28, quoted) makes no mention of ojas, and the record has not searched the corpus systematically for a passage that joins the two terms explicitly. - Whether the half-anjali measure is reproducible as a reading is not established. Charaka introduces the anjali list as known by inference rather than direct perception, and Kaviratna's footnote at the ojas line records a competing manuscript reading that Gangadhara followed, so the line this record now quotes is itself textually disputed. ## The terms this concept is built from | Term | What it names | | --- | --- | | [Ojas](https://nighantu.ageayurveda.com/lexicon/ojas/) | The refined essence of all seven dhatus; the substance whose presence sustains life and whose loss ends it. | | [Para ojas](https://nighantu.ageayurveda.com/lexicon/para-ojas/) | The 'superior' ojas, said in modern teaching to reside in the heart in a very small fixed quantity, loss of which is fatal. Neither the term para ojas nor the eight-drop quantity could be located in the two public-domain translations searched in full text, so no chapter and verse is asserted for either. Charaka's cardiac seat of "the foremost Ojas" (Sutrasthana 30, quoted below) is the nearest retrieved anchor, and it carries no quantity. | | [Apara ojas](https://nighantu.ageayurveda.com/lexicon/apara-ojas/) | The 'ordinary' ojas, a larger circulating quantity distributed through the body and responsive to diet, drugs and regimen. The half-anjali measure IS in the retrieved public-domain Charaka: Sharirasthana 7 (Sharira-sankhya) gives the measure of ojas as half an anjali, quoted below. What is not in the retrieved text is the attachment of that measure to a term apara ojas, or any para/apara division at all; the earlier statement in this record that the half-anjali figure could not be located was wrong and is corrected. | | [Bala](https://nighantu.ageayurveda.com/lexicon/bala/) | Strength, in the classical usage covering physical capacity, resistance and resilience; often used as the observable proxy for ojas. Charaka divides it three ways, by nature, by season and by exertion, in Sutrasthana 11 (quoted below), and Charaka Sutrasthana 30 says flatly that "The Ojas is the strength of the body." | | [Vyadhikshamatva](https://nighantu.ageayurveda.com/lexicon/vyadhikshamatva/) | The capacity both to resist the onset of disease and to withstand it once present. The term closest in function to 'immunity', though broader. | | Ojo-visramsa | Displacement of ojas from its seat: looseness of joints, inertness, fatigue, dislodgement of the doshas, suppression of bodily and mental function. Sourced to Sushruta Sutrasthana 15 in Bhishagratna's rendering, quoted below. | | Ojo-vyapat | Corruption of ojas by contact with vitiated humours: numbness and heaviness of limbs, dropsical swelling attributed to deranged vayu, discoloured complexion, malaise, drowsiness and somnolence. Sourced to Sushruta Sutrasthana 15 in Bhishagratna's rendering, quoted below; this sign list was an uncited assertion in the previous version of this record. | | Ojo-kshaya | Wasting of ojas: fainting, emaciation, mental distraction, delirium, loss of consciousness, death. Declared incurable at the extreme. Sourced to Sushruta Sutrasthana 15 in Bhishagratna's rendering, quoted below. | | Causes of ojas depletion | Injury, chronic wasting disease, anger, grief, worry, exertion and hunger - a list mixing physical insult with sustained emotional and metabolic strain. | | [Rasayana](https://nighantu.ageayurveda.com/lexicon/rasayana/) | The class of rejuvenative therapy prescribed to restore ojas. Sushruta assigns it specifically to visramsa and vyapat and withholds it from advanced kshaya, in the sentence quoted below. It is the practical intervention arm of the concept, and the arm where trials have been run, though the trials test formulations rather than the construct. | | Hridaya as seat | The heart, described as the receptacle of ojas and the root of the ten great vessels that carry it throughout the body. | | Anjali-pramana of ojas | Charaka's measure-by-palmful list in Sharirasthana 7 assigns ojas half an anjali, the same measure as brain and semen, an anjali being the hollow of the two joined palms. The list is introduced by Charaka himself as known by inference rather than by direct perception, and Kaviratna's footnote to the ojas line records a variant reading that would have made ojas a kind of phlegm, which Kaviratna rejects in his own voice. | ## The classical passages Each citation gives its address so a reader can check it in a printed edition, our account of what it establishes, and the result of reading it against its source. ### Sushruta Samhita Sutrasthana 15 (Dosha-Dhatu-Mala-Kshaya-Vriddhi-Vijnaniya):prose section; Bhishagratna's rendering carries no verse numbers, checked against the source > The quintessence of all the fundamental principles of the body, starting with lymph chyle and ending with semen, is called the Ojas, which is identical with what is termed 'vital power.' tr. Kunja Lal Bhishagratna (1907-1916) Sushruta's definition of ojas as the distilled essence of the whole tissue sequence rather than a distinct substance, in a lawfully quotable public-domain translation. Source: https://archive.org/stream/b24758619_0001/b24758619_0001_djvu.txt ### Sushruta Samhita Sutrasthana 15:prose section, checked against the source > This Ojas (albumen) or strength-giving principle serves to impart a firm integrity to the flesh (and the muscles), exercises unbounded control over all acts of vitality, improves the voice and complexion, and helps both the external (operative) and the internal (intellectual) sense organs, in duly performing their natural functions. tr. Kunja Lal Bhishagratna (1907-1916) The functional scope claimed for ojas: tissue integrity, vitality, voice, complexion and sensory and cognitive function. Note how much wider this is than immune competence. Source: https://archive.org/stream/b24758619_0001/b24758619_0001_djvu.txt ### Sushruta Samhita Sutrasthana 15:prose section on the causes and modes of derangement, checked against the source > A blow, a persistent wasting disease, anger, grief, cares and anxieties, fatigue and hunger, are the causes to which should be ascribed the wasting or disappearance of this strength-giving principle (albumen) of the body. The bodily albumen, through the agency of the abovesaid causes, is wasted through the channels carrying the different fundamental principles of the body. Albumen is transformed into strength which radiates from the heart. tr. Kunja Lal Bhishagratna (1907-1916) The aetiology of ojas depletion, which places emotional strain (anger, grief, anxiety) alongside physical insult and starvation, and the claim that ojas is converted into bala radiating from the heart. Source: https://archive.org/stream/b24758619_0001/b24758619_0001_djvu.txt ### Sushruta Samhita Sutrasthana 15:'Authoritative verses on the subject', prose section, checked against the source > A deranged state of albumen is marked by the three abovesaid properties of dislodgment from its proper seat (Visransha); by a change of its natural virtues through contamination (Vyapad) and by wasting (Kshaya). The first of these properties (Visransha) is characterised by looseness of the joints, by an inert state of the body, by a sense of fatigue, by a dislodgment of the deranged humours from their natural seats, and by a suppression of the bodily and intellectual functions. tr. Kunja Lal Bhishagratna (1907-1916) The threefold classification of ojas derangement and the clinical signs of the first mode - the nearest thing in the corpus to diagnostic criteria for an ojas disorder. Source: https://archive.org/stream/b24758619_0001/b24758619_0001_djvu.txt ### Sushruta Samhita Sutrasthana 15:prose section, continued, checked against the source > The loss or waste of Ojah (albumen) is marked by such symptoms as fits of fainting, emaciation of the body, bewilderment and distraction of the mind, delirium and loss of consciousness and ultimately death. ... A patient who has lost all consciousness (owing to an excessive loss or waste of albumen) should be given up by a physician (as incurable). tr. Kunja Lal Bhishagratna (1907-1916) The signs of ojo-kshaya and the explicit prognostic declaration of incurability at its extreme - a clinical claim, and one that has never been evaluated. Source: https://archive.org/stream/b24758619_0001/b24758619_0001_djvu.txt ### Charaka Samhita Sutrasthana 17 (Kiyantah Shirasiya):73-74 (as printed; the OCR of this fascicule renumbers irregularly around these lines), checked against the source > When the element called Ojas becomes attenuated, the patient yields to causeless fears, becomes weak, indulges in anxious thoughts ceaselessly, and feels pain in all his senses. His body again loses its splendour; he becomes cheerless; a dryness pervades the whole system; and a languor comes over him so that he feels fatigue upon the slightest exertion. There resides in the heart a quantity of pure blood, which is slightly yellowish. This blood in the body is called Ojas. Through attenuation of this blood or its loss, even death may overtake the man. tr. Avinash Chandra Kaviratna (1896-1913) Charaka's clinical picture of ojas depletion - and, crucially, his identification of ojas with a slightly yellowish pure blood residing in the heart, which is materially a different claim from Sushruta's essence-of-all-dhatus. Source: https://archive.org/stream/BIUSante_47357/BIUSante_47357_djvu.txt ### Charaka Samhita Sutrasthana 17:114 (as printed), checked against the source > It is the phlegm that is also called the Ojas in the system. When its normal condition becomes altered, it becomes a source of evil. tr. Avinash Chandra Kaviratna (1896-1913) A third and incompatible identification of ojas, with normal kapha, appearing in the same chapter of the same text some forty verses after the heart-blood definition. This internal inconsistency is the single most important fact about the classical account. Source: https://archive.org/stream/BIUSante_47357/BIUSante_47357_djvu.txt ### Charaka Samhita Sutrasthana 30 (Arthedasha-Mahamuliya):6-10 (as printed; the OCR renders some superscript numerals unreliably), checked against the source > The heart is the seat (or receptacle) of the foremost Ojas. It is also the seat of supreme Brahman. For these reasons the heart is called Mahat (Great) and Artha (precious possession), by physicians. Because the heart or Mahat is the root of the ten ducts, therefore these are called Mahamula (having the Great for their root). These bear the Ojas and run into every part of the body. All embodied creatures, vivified by the Ojas, move about or act. Without it, the life of all creatures becomes extinct. The Ojas operates in the first place as the essence of conception. ... Dwelling in the heart, it sustains or supports life. The Ojas is the strength of the body. The body and the life-breaths are established in it. tr. Avinash Chandra Kaviratna (1896-1913) The cardiac seat of ojas, its distribution through the ten great vessels, and the breadth of its remit - conception and foetal development as well as strength and life itself. This is the passage showing ojas is not a synonym for immunity. Source: https://archive.org/stream/BIUSante_47357/BIUSante_47357_djvu.txt ### Charaka Samhita Sutrasthana 17:translator's footnote to verse 74, recording a couplet present only in some recensions, checked against the source > That which is called Ojas at first appears in the bodies of embodied creatures, endued with the color of clarified butter. In taste it resembles honey. Its scent resembles that of fried paddy. As honey is gathered by bees from diverse kinds of flowers and fruits, even so is the Ojas of men gathered by the wind, bile, and phlegm from the several elements mentioned above. tr. Avinash Chandra Kaviratna (1896-1913) The sensory description of ojas (ghee-coloured, honey-tasting, smelling of parched grain) that later biomarker proposals lean on when arguing it is a lipid - and the fact that the translator flags it as present only in some texts, so the description is not firmly part of the received text. Source: https://archive.org/stream/BIUSante_47357/BIUSante_47357_djvu.txt ### Sushruta Samhita Sharirasthana 3 (Garbhavakranti):16 **Quotation withheld:** nobody has yet read this quotation against its printed source, and an unchecked quotation is not published here. The passage is at https://archive.org/stream/englishtranslati00susruoft/englishtranslati00susruoft_djvu.txt The doctrine that ojas passes back and forth between mother and foetus in the eighth month, the classical explanation for eighth-month prematurity - and an example of an ojas claim with a testable-looking form that has never been examined. ### Ashtanga Hridaya (Vagbhata) Sutrasthana 11 (Doshadi Vijnaniya Adhyaya):in the region of 37-40 per secondary sources; not asserted Vagbhata's account of ojas - its location chiefly in the heart, its unctuous and slightly reddish-yellow character, the causes of its decrease (anger, hunger, worry, grief, exhaustion) and the resulting fear, weakness and emaciation. Located only: there is no public-domain English translation of the Ashtanga Hridaya, so this may be paraphrased but never quoted, and the verse numbers circulating in secondary sources are not verified here. ### Sushruta Samhita Sutrasthana 15 (Dosha-Dhatu-Mala-Kshaya-Vriddhi-Vijnaniya):'Authoritative verses on the subject', prose section; Bhishagratna prints no Sanskrit verse numbers, checked against the source > Numbness and heaviness of the limbs, malaise, a discoloured complexion, drowsiness, somnolence and dropsical swelling brought about by a deranged state of the bodily Vayu, should be considered as natural consequences of the Vyapad (change of the natural virtues of albumen through contamination). tr. Kunja Lal Bhishagratna (1907-1916) The sign list for ojo-vyapat, which component 7 of this record asserted without a citation until this revision. The same six signs appear in the prose a page earlier, but in a different order ("numbness and heaviness of the limbs, dropsy due to the action of the deranged bodily Vayu, discoloured or changed complexion, feeling of malaise, drowsiness and somnolence"), dropsy standing second in the prose and last in these verses, and malaise fourth in the prose and second here. The set of six signs is therefore doubly attested within the chapter, while the sequence is not. What this citation establishes is which six signs Sushruta assigns to the Vyapad; it establishes nothing about any order or priority among them. Source: https://archive.org/download/b24758619_0001/b24758619_0001_djvu.txt ### Sushruta Samhita Sutrasthana 15:prose section following the 'Authoritative verses'; no verse numbers in this translation, checked against the source > The medical treatment in cases of dislodgment or flowing out external secretion of albumen from its natural seat (Visransha), as well as in the event of it becoming contaminated by the vitiated principles of the body, should consist in improving its quantity by elixirs and remedies possessed of rejuvenating properties, tending to increase the quantity of such fluid (albumen) in the body. A patient who has lost all consciousness (owing to an excessive loss or waste of albumen) should be given up by a physician (as incurable). tr. Kunja Lal Bhishagratna (1907-1916) The treatment rule and the prognosis together, in the order the text gives them: rasayana for visramsa and vyapat, abandonment for kshaya that has reached loss of consciousness. The record previously quoted only the second sentence while its establishes field leaned on the first, which is the defect the critic identified. Source: https://archive.org/download/b24758619_0001/b24758619_0001_djvu.txt ### Charaka Samhita Sutrasthana 28 (Vividhashitapitiya):Charaka Samhita, Sutrasthana 28 (Vividhashitapitiya). In Kaviratna's numbering, which prints the aphorism number after the aphorism: aphorism 13 plus the opening sentence of aphorism 14, since 13 is printed after 'are incapable of resisting diseases' and 14 after the following 'mild or virulent, quickly-arising or slow in generation' sentence, which this citation does not quote. Printed pp. 395 to 396. In the Trikamji vulgate numbering the whole quoted span sits inside a single prose sutra, Ca.Su. 28/7, verified against the GRETIL Carakasamhita e-text at '// Car_1,28.7'., checked against the source > Those bodies which are very fat, or which are very lean, or which are made up of flesh, blood and bones that are either undeveloped or of measure less than normal, or which are destitute of strength, or which are supported by such kinds of food as are not agreeable to them, or which depend upon a very small measure of food, or which are endued with very little vitality, are incapable of resisting diseases. These bodies which are the reverse of those described above are capable of resisting diseases. tr. Avinash Chandra Kaviratna (1896-1913) The clearest classical statement of differential resistance to disease that this gathering has retrieved, and the one that ties resistance to the adequacy of the dhatus and to a measure less than normal rather than to ojas by name. It is the bridge between the tissue-quantity doctrine and vyadhikshamatva. It also sets the limit of the bridge: ojas is not named in it, so it supports a claim about dhatu adequacy and resistance, not a claim that ojas is what resistance consists of. Source: https://archive.org/download/BIUSante_47357/BIUSante_47357_djvu.txt ### Charaka Samhita Sutrasthana 11 (Tistraishaniya):31 as printed by Kaviratna, after the aphorism; the standard-edition number is not established here, checked against the source > There are three kinds of strength, viz., that which is due to one's nature, that which is due to a particular season (of life or the year); and that which is due to exertion (such as physical exercise, the use of invigorating food and spices and liquors, &c). Natural strength implies that kind of strength which inheres to the very nature of one's body and mind. By the second kind of strength is meant that strength which depends upon either a particular season of life (such as youth, manhood, &c.), or of the year (as spring, summer, &c), The third kind of strength is that due to the use of particular kinds of food and physical exercise tr. Avinash Chandra Kaviratna (1896-1913) The threefold division of bala, constitutional, seasonal and acquired, in a lawfully quotable public-domain English rendering. Because Charaka elsewhere says the ojas is the strength of the body, this division is the closest the corpus comes to saying that resistance has a fixed component and a modifiable one, which is the structural claim the para/apara teaching is usually used to carry. Source: https://archive.org/download/BIUSante_47357/BIUSante_47357_djvu.txt ### Charaka Samhita Sharirasthana 7 (Sharira-sankhya):prose list of anjali measures; the marginal aphorism numerals on these lines are OCR-destroyed and are not reconstructed, checked against the source > Of the Marrow the measure is 1 'anjali.' Of the Brain the measure is half an 'anjali.' Of the Semen the measure is the same (as above). Of the Ojas the measure is the same (as above). tr. Avinash Chandra Kaviratna (1896-1913) The half-anjali measure of ojas, in the retrieved public-domain Charaka. This overturns this record's own earlier negative result, which reported that the half-anjali figure could not be located in either public-domain translation. It is scriptural, not commentarial. What it does not establish is the para/apara reading: the list gives one measure for ojas and uses no para or apara vocabulary, and Charaka introduces the whole list as known by inference rather than by direct perception. Source: https://archive.org/download/BIUSante_47357/BIUSante_47357_djvu.txt ### Charaka Samhita Sharirasthana 7 (Sharira-sankhya):Kaviratna's footnote to the ojas line of the anjali list, signed "T.", checked against the source > Some texts read '[transliteration OCR-destroyed in the scan and not reconstructed].' Gangadhara, following this reading, explains it as meaning 'the particular kind of phlegm known as ojas.' This can be hardly correct. The 'ojas' has been before described. It is not regarded as any kind of phlegm. On the other hand, it is the blood of blood, the most vital 'dhatu' in the body. The reading is evidently incorrect. tr. Avinash Chandra Kaviratna (1896-1913) Two things, and the second is the more important. First, that a textual variant exists at this point under which ojas is a kind of phlegm, which Gangadhara's commentary adopted, so the kapha identification is not confined to Sutrasthana 17.114. Second, that Kaviratna then settles the question in his own voice, calling ojas "the blood of blood, the most vital dhatu in the body". That is the translator asserting a doctrine, not Charaka, and it is the exact failure mode this project has recorded three times. Any modern claim that Charaka identifies ojas with blood should be checked against this note before it is attributed to the text. Source: https://archive.org/download/BIUSante_47357/BIUSante_47357_djvu.txt ### Charaka Samhita Sharirasthana 4 (Mahati-Garbhavakranti):31 as printed by Kaviratna, after the aphorism; the Sanskrit source used elsewhere in this record numbers the same passage 24, and the discrepancy is not resolved here, checked against the source > In the eighth month the foetus draws from the mother, and the mother draws from the foetus, through the juice-bearing ducts, again and again, that ingredient (dhatu) which is called ojas. Indeed, each takes it from the other (at successive moments of time). ... Hence, at this stage of pregnancy, the life of the child in the womb becomes fraught with danger in consequence of the inconstancy of the ojas. Beholding this, the eighth month is not counted by those who are skilled (in the science of obstetrics). tr. Avinash Chandra Kaviratna (1896-1913) The eighth-month ojas exchange between mother and foetus, in a lawfully quotable public-domain English rendering. This is the doctrine for which the record previously had only a Sanskrit original, on the stated ground that Kaviratna does not reach Sharirasthana. He does, and this is the passage. The claim itself remains untested, which is recorded in notKnown. Source: https://archive.org/download/BIUSante_47357/BIUSante_47357_djvu.txt ## What the research actually shows Every paper located for this concept, with what it measured and what it does and does not establish. The assessment is ours. ### Stress, steroids, and "ojas": neuroendocrine mechanisms and current promise of ancient approaches to disease prevention. Indian J Physiol Pharmacol · 1995 · PMID 7705867 (https://pubmed.ncbi.nlm.nih.gov/7705867/) The first sustained modern proposal for a biochemical identity of ojas: Walton and Pugh argue that specific steroids and steroid classes are the likely candidates for the 'ordinary' and 'superior' types of ojas, and situate the concept within stress and neuroendocrine research on homeostasis. **How much it shows.** Narrative review with an embedded hypothesis, in Indian J Physiol Pharmacol. No experiment, no cohort, no measurement of anything called ojas. The authors are candid that the linkage was made possible by a particular interpretive tradition, and the paper's affiliation (Maharishi International University) is disclosed on its face. Thirty years on, the steroid proposal has not been tested. ### Can cholesterol and its products serve as biomarkers for ojas? J Ayurveda Integr Med · 2025 · PMID 41289791 (https://pubmed.ncbi.nlm.nih.gov/41289791/) The most recent biomarker proposal: Sumantran and Nair argue that cholesterol and its downstream products (steroid hormones, bile acids, vitamin D, myelin) are candidate biomarkers for ojas, with HDL-C as a possible surrogate for healthy apara ojas, reasoning from five classes of correspondence. **How much it shows.** Hypothesis paper, not an empirical study. The authors describe their own evidence as 'correlative, potentially causal, and clinical' and their conclusion as a hypothesis with 'candidate' biomarkers; the correspondences are drawn from existing cholesterol literature and mapped onto classical descriptions of ojas. No ojas was measured, no cohort was assessed, no assay was developed or validated. Its main value for this record is as documentation that after thirty years the field is still at the proposal stage. ### A short review on deciphering Vyadhikshamatva: insights from HLA-B27-ankylosing spondylitis relation. J Complement Integr Med · 2024 · PMID 38702944 (https://pubmed.ncbi.nlm.nih.gov/38702944/) An attempt to read vyadhikshamatva against a concrete immunogenetic finding, the HLA-B27 association with ankylosing spondylitis. **How much it shows.** Short narrative review. It maps classical categories onto an established immunological association rather than generating or testing a prediction from the Ayurvedic side. Representative of the genre: modern immunology supplies the content, the Ayurvedic vocabulary supplies a restatement. ### Safety and Efficacy of Chyawanprash as a Prophylaxis Treatment for COVID-19: A Systematic Review and Meta-Analysis of Randomized Control Trials. Cureus · 2024 · PMID 39544586 (https://pubmed.ncbi.nlm.nih.gov/39544586/) The best available quantitative test of an ojas-restoring intervention. A systematic review and meta-analysis of five randomised controlled trials of Chyawanprash as COVID-19 prophylaxis, pooling 153,343 participants, reporting odds ratios of 0.45 (95% CI 0.06-3.08) for COVID-19 positivity, 0.37 (95% CI 0.01-12.86) for symptomatic positivity, 0.95 (95% CI 0.18-5.04) for healthcare resource use and 0.94 (95% CI 0.63-1.40) for adverse events. **How much it shows.** A genuine meta-analysis of RCTs, so methodologically the strongest item here, and its result is null: every confidence interval crosses 1, with severe heterogeneity (I-squared 80% and 83% for the two efficacy outcomes). The authors themselves note high heterogeneity and bias and call for further research. It also tests a formulation, not the construct - a null result says nothing about whether ojas exists, and a positive one would not have shown that it does. The safety signal (no excess adverse events) is the most secure finding. ### Role of Kasahara Dashemani Vati in Kasa and Vyadhikshamatva in children with special reference to recurrent respiratory tract infections. Ayu · 2013 · PMID 24501524 (https://pubmed.ncbi.nlm.nih.gov/24501524/) A small clinical study explicitly framed around vyadhikshamatva, evaluating Kasahara Dashemani Vati in children with recurrent respiratory tract infections. **How much it shows.** Small single-centre trial in Ayu. Uses recurrent infection frequency as a proxy for vyadhikshamatva without validating that proxy, and provides no measure of the construct independent of the clinical outcome it is meant to explain. ### An observational study on acceptability, palatability, and safety of Ayurveda immunity booster kit for the prevention of COVID-19 in frontline workers in Jaipur, India. Ayu · 2021 · PMID 37303860 (https://pubmed.ncbi.nlm.nih.gov/37303860/) An observational study of an 'Ayurveda immunity booster kit' in frontline workers during COVID-19, reporting on acceptability, palatability and safety. **How much it shows.** Observational, and explicitly not an efficacy study - no control group and no immune endpoint. Included here as an honest illustration of how the 'immunity' framing has been deployed in practice: the outcome measured was whether people would take it, not whether it did anything. ### Molecular approach to ayurveda. Indian J Exp Biol · 2000 · PMID 11272402 (https://pubmed.ncbi.nlm.nih.gov/11272402/) A third proposal in the indexed literature for a molecular correlate, earlier than either of the two the record previously carried. Mishra, Singh and Dagenais propose monitoring the doshas through free-radical and signalling parameters, with kapha read as the degree of gene expression as protein synthesis, and state that this "can be correlated with the ojas of the body or total body defence mechanism". Its existence is why the record no longer says there are two proposals. **How much it shows.** Narrative review in Indian J Exp Biol proposing objective parameters for the doshas. No experiment, no measurement, no cohort, and the ojas sentence is a single clause at the end of a dosha-focused argument rather than a developed identification. It is weak evidence for anything about ojas, and that is the point: it is strong evidence that a census of two was wrong. ### Conceptualization and design of an Ayurveda framework for the diagnosis of Duchenne Muscular Dystrophy: insights from a prospective cohort study. J Ayurveda Integr Med · 2026 · PMID 42161239 (https://pubmed.ncbi.nlm.nih.gov/42161239/) The one retrieved study in which a mode of ojas derangement was operationalised as a variable and scored in a cohort. A three-year prospective observational cohort of 67 participants with molecularly confirmed Duchenne muscular dystrophy, not on steroids, assessed with Ayurvedic staging; the authors report that under rogavastha significant differences between ambulation stages were observed in Sarvagatavata, Asthimajjagatavata and Ojovisramsa. **How much it shows.** Cross-sectional baseline data from a cohort study, in J Ayurveda Integr Med. It is a framework paper: the Ayurvedic categories are the instrument, not the thing being validated, and the paper reports no interrater reliability for the ojovisramsa judgement, no case definition that another team could apply, and no comparison against an external standard. So it shows that ojovisramsa can be scored and that the scores track a disease stage in one rare-disease cohort; it does not show that the scoring is reproducible or that it measures ojas. It is cited here because the previous version of this record said flatly that the three derangement modes have no operational criteria and no reported prevalence in any population, and that was too strong. ### Randomized placebo-controlled pilot clinical trial on the efficacy of ayurvedic treatment regime on COVID-19 positive patients. Phytomedicine · 2021 · PMID 33596494 (https://pubmed.ncbi.nlm.nih.gov/33596494/) The retrieved answer to the question the record's notKnown asked, namely whether any trial of an ojas-restoring regimen measured an immune parameter. This one did: a placebo-controlled randomised double-blind pilot trial in asymptomatic COVID-19 (CTRI/2020/05/025273) of Giloy Ghanvati, Swasari Ras, Ashwagandha and Tulsi Ghanvati with Anu taila, quantifying serum IL-6, TNF-alpha and hs-CRP by chemiluminescent immunometric assay on day 1 and day 7, and reporting average fold changes in the treatment group 12.4, 2.5 and 20 times lower than placebo at day 7. **How much it shows.** A real randomised placebo-controlled trial with real immune endpoints, and it still says nothing about ojas, which is the finding. Ojas was not the exposure, not an outcome, and not measured; the abstract does not use the word. The design is a pilot, the regimen is a four-drug combination so no component is isolated, recovery was assessed by RT-qPCR clearance in an asymptomatic population where most recover anyway, and the inflammatory markers are reported as average fold changes rather than with confidence intervals. Its value to this record is precise and limited: the post-2020 literature did measure immune parameters under Ayurvedic interventions, so the gap in the ojas account is not that nobody measured immunity, it is that nobody measured ojas alongside it. ### Co-administration of AYUSH 64 as an adjunct to standard of care in mild and moderate COVID-19: A randomized, controlled, multicentric clinical trial. PLoS One · 2023 · PMID 36928877 (https://pubmed.ncbi.nlm.nih.gov/36928877/) The AYUSH-64 evidence the critic asked to be searched. A randomised, controlled, assessor-blind multicentric trial of AYUSH 64 added to standard of care in 140 hospitalised adults with mild to moderate COVID-19, reporting mean time to clinical recovery 6.45 versus 8.26 days (95% CI of the difference -3.02 to -0.59, P = 0.003 per protocol, P = 0.002 on intention to treat), 48 adverse events in each arm and no deaths. **How much it shows.** Methodologically the stronger of the two AYUSH-64 trials retrieved and a positive result on a clinical endpoint, which makes it the right test of the critic's expectation. It carries no immune endpoint at all and no ojas or vyadhikshamatva measurement, so a positive result here is evidence about a polyherbal formulation in COVID-19 and not evidence about the construct. The open-label design with an assessor blind, the convenience sample and the single pandemic wave are its main limits. A second AYUSH-64 randomised trial (PMID 34908795, Ayu 2022, n = 60) found no significant difference in RT-PCR conversion, which is why no direction of effect is claimed here. ### A clinical study on the Naimittika Rasayana effect of Silajatu and Mamajjaka in type-2 Diabetes Mellitus. Ayu · 2014 · PMID 26195903 (https://pubmed.ncbi.nlm.nih.gov/26195903/) How the ojas-as-immunity equation is actually used in clinical research: a three-arm clinical study of Silajatu and Mamajjaka as naimittika rasayana in 84 followed-up patients with type 2 diabetes, whose authors frame Prameha patients as carrying "impaired Agni and depleted Ojas status, that is, hypometabolic and immuno-compromised state" and conclude that the drugs promote "Agni (biofire) and Ojas (immune strength) status". **How much it shows.** Small open study in Ayu with modern-drug comparison, outcomes reported as subjective and objective response and post-prandial blood sugar. Ojas appears in the framing and in the conclusion and nowhere in the measurements; the gloss "Ojas (immune strength)" is asserted, not derived. Included as an exhibit of the interpretive slide the record describes, not as evidence for it. ## Open questions on this record Recorded rather than resolved. - Why Kaviratna's aphorism numbering diverges from the Sanskrit source's for the eighth-month passage (31 against 24) is unresolved, and so is whether the documented off-by-one offset in this translation extends to Sutrasthana 11, 17, 28 and 30 and Sharirasthana 4 and 7. Every Charaka location in this record is given as Kaviratna prints it for that reason. ## Citation Age Ayurveda Nighantu, "Ojas and the Ayurvedic Account of Resistance to Disease", https://nighantu.ageayurveda.com/concept/ojas-and-immunity/, CC BY 4.0. Whole concept set: https://nighantu.ageayurveda.com/concepts.json and https://nighantu.ageayurveda.com/concepts.csv. Educational reference only. This page describes what a body of theory claims and how well it is evidenced. Nothing here is advice, and nothing here describes how any condition should be treated.