Vyadhikshamatva: resistance to disease
How much weight this concept bears. Vyadhikshamatva rests on classical exegesis. In the records examined for this entry (the PubMed searches listed in searchLog, run on 2026-10-06, and the references carried from the first pass) there is no operational definition of it, no validated measure, no biomarker, and no study in which a person's vyadhikshamatva was assessed at baseline and found to predict subsequent illness. That is a statement about the records examined, not about the field. The term-level searches are spelling-sensitive (4, 2, 0 and 3 hits for four transliterations; 6 combined), and the construct-adjacent searches (rasayana AND immunomodulation, 57 hits; prakriti AND immune AND ayurveda, 12; ojas AND ayurveda, 10; bala AND ayurveda AND immunity, 9) were counted and not screened, so a study that operationalises host resistance under other vocabulary may exist and would not have been found here. Of the six records the combined term search returns, two are narrative reviews that restate the classical account in immunological vocabulary and propose a correspondence (38702944, 32837101), one is a perspective piece (38176303), one a single case report in which 'need of good immunity (Vyadhi-Kshamatva)' is a clinical diagnosis (38306823), one a small two-active-arm trial that named vyadhikshamatva as an endpoint and operationalised it ad hoc (24501524), and one an uncontrolled acceptability study of an immunity kit (37303860). The 2025 cholesterol-as-ojas paper (41289791), found outside the term search, is a hypothesis paper that calls its own links correlative. The one controlled study found, AYURAKSHA (36052011), compares 101 kit users with 71 controls drawn without randomisation from 47,827 recipients and reports lower COVID-19 IgG positivity in the kit group; it tests a product, not the construct, and its design cannot separate the kit's effect from selection and exposure differences. The equation of vyadhikshamatva with immunity is the working assumption in each of these records; it is an interpretive overlay applied retrospectively, since the classical text describes no cells, no agents, no barrier and no memory, and defines resistance by a phenotypic checklist of body habitus, tissue adequacy, strength, nutrition and vitality (Su. 28.7), with the proportionate, hardy body of Su. 21.18-19 as its positive. That some items on the checklist (undernutrition, extremes of body mass) are also general predictors of infection outcome in modern epidemiology is not evidence for the Ayurvedic construct, because those predictors hold regardless of any theory about them, and this record does not use the overlap as support. Ojas, which supplies the concept's supposed mechanism, is identified with bala by Sushruta (Su.Su. 15.19, where the text itself marks the identification as a school position) and is seated in the heart and made the condition of life by Charaka (Ca.Su. 30.7-11); a vital principle whose absence is death is outside the class of things a laboratory parameter could measure. The two-part analysis of vyadhikshamatva into opposing disease strength and preventing disease arising is Chakrapani's gloss on Su. 28.7 (Ayurvedadipika, quoted in the classical section), not Charaka's text, and it is often cited as though primary. The honest summary is that this is a coherent classical construct carrying a host-susceptibility checklist that is stated as a list and not as a mechanism, and that it has not been operationalised, measured or tested in any record this entry examined.
Vyadhikshamatva is the classical term for a body's capacity to resist disease. Charaka introduces it by negation: not all bodies are capable of resisting disease (Su. 28.7), and he then lists the bodies that are not, the very fat, the very lean, those with poorly developed flesh, blood and bone, those lacking strength, those on unsuitable or insufficient food, and those of feeble vitality. The same chapter's own pair of terms is vyadhi-sahatva and a-vyadhi-sahatva, bodies that bear disease and bodies that do not. Charaka's chapter on the eight censurable constitutions supplies the positive counterpart: the man of proportionate build and compact frame, with firm senses, 'is not overcome by the strength of diseases', while the very fat and the very lean are 'always diseased' (Su. 21.16-18). The concept is tied to bala (strength), which Charaka classifies as threefold: sahaja (innate), kalaja (dependent on age and season) and yuktikrita (acquired through regimen, diet and exercise) (Su. 11.36). Sushruta identifies ojas with bala outright, as the quintessence of all the dhatus from rasa to shukra, and marks that identification as his own school's doctrine (Su.Su. 15.19); Charaka seats ojas in the heart and makes life depend on it (Ca.Su. 30.7-11). Vyadhikshamatva is therefore not a separate system but a composite of constitution, tissue adequacy, nutrition, strength and ojas, and it is explicitly variable between individuals. Modern Ayurvedic writing routinely equates it with immunity; the classical texts describe no cells, no agents of infection and no mechanism, and the equation is an interpretive overlay.
| Subject area | How the body is held to work |
|---|---|
| Domain, as recorded | health-and-physiology |
| Contested questions | 4 |
| Stated as not known | 13 |
| Classical citations | 13, 12 quoting the text |
| Research papers assessed | 6 |
| 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.
Is vyadhikshamatva the same as immunity?
This is contested.
- Yes, the standard position in modern Ayurvedic literature, which treats it as the classical anticipation of immunology and measures it with immunoglobulins and infection frequency
- No: the classical description is a host-susceptibility checklist inside a dose-response account of disease causation, with no agents, cells, specificity or memory; equating it with immunity imports content the sources do not contain
- Partially: it overlaps with what is now called host resistance or resilience, a broader and less specific notion than immunity
Is ojas a substance or a principle?
This is contested.
- Substance: Sushruta describes it as having colour, unctuousness, stability and mobility (Su.Su. 15.21), as quantifiable, and as capable of depletion, which invites a material reading (Bhishagratna rendered it 'albumen'; others have proposed cholesterol or HDL-C)
- Principle: Charaka states that without its loss there is no death (Ca.Su. 30.11), making it coextensive with life rather than a measurable constituent
- Bhishagratna's own footnote records the dispute inside the tradition, noting that several authorities held ojas to be only one of the essentials of vitality and not identical with vital power
- The Sanskrit of Su.Su. 15.19 itself marks the identification of ojas with bala as a school position (svashastrasiddhantat), so the disagreement Bhishagratna footnotes is acknowledged in the text; and the Charaka line Kaviratna renders 'The Ojas is the strength of the body' (30.11) is textually unstable, the Trikamji-based text reading yach chharirarasasnehah with no word for strength and Kaviratna footnoting that the line is read differently
Is vyadhikshamatva primarily constitutional or modifiable?
This is contested.
- Constitutional: Charaka's list at Su. 28.7 is dominated by body habitus and tissue adequacy, largely given
- Modifiable: one of the three balas (yuktikrita) is explicitly acquired through diet, exercise and regimen, and the whole rasayana literature depends on this
- Charaka's own aetiologies of the two censured habitus mix the two: obesity at Su. 21.4 ends with bijasvabhava (the nature of the seed; Kaviratna: heredity) after seven behavioural causes, and leanness at 21.12 lists prakriti and jara (nature, ageing) alongside diet, over-purgation, grief and anger
- No source quantifies the relative contribution, and no record examined for this entry has attempted to
Where does the two-part analysis of vyadhikshamatva come from?
This is contested.
- It is treated in most modern papers as a classical distinction, cited alongside Charaka Su. 28.7
- It is in fact Chakrapani's commentarial gloss, not part of Charaka's text, and the distinction between preventing disease arising and limiting disease already present is a commentator's analysis
- Confirmed in revision against the Ayurvedadipika on Su. 28.7, note 9: vyadhikshamatvam vyadhibalavirodhitvam vyadhyutpadapratibandhakatvam iti yavat (quoted in the classical section)
What is not known
Stated rather than left out. Where a negative has actually been searched for rather than assumed, the entry says so.
- How vyadhikshamatva would be measured in an individual. No validated instrument, index or biomarker appears in any record examined for this entry.
- Whether any person's assessed vyadhikshamatva predicts subsequent infection, disease incidence or severity. No prospective test of this appears in the records examined; the construct-adjacent searches were not screened and could in principle contain one.
- What ojas is, in any measurable sense. Every proposed correlate in the records examined (albumen, cholesterol, HDL-C, immunoglobulins) has been a proposal, none validated against an independent measure of ojas, because no independent measure exists.
- Whether ojas can be quantified at all, given that the texts define its complete loss as death.
- Whether the classical phenotypic checklist (very fat, very lean, undeveloped tissue, low strength, unsuitable or insufficient diet, feeble vitality) adds anything to existing measures of nutritional status and frailty. No such comparison appears in the records examined. Note that a demonstrated overlap would not by itself be evidence for the Ayurvedic construct, since undernutrition and extremes of body mass predict infection outcome generally.
- Whether rasayana interventions change vyadhikshamatva, since neither the intervention's mechanism nor the outcome is defined in measurable terms.
- How the three balas relate quantitatively, and whether the modifiable fraction is large or small.
- Whether the ojas-derangement triad (visransa, vyapad, kshaya) corresponds to distinguishable, measurable clinical states. The text gives each a sign-list (Su.Su. 15.24), so the question is not whether the triad has clinical content but whether that content maps onto anything that can be independently identified; no record examined addresses this.
- Whether the psychological causes of ojas depletion named by Sushruta (anger, grief, brooding) have any demonstrable relation to measured host resistance. No record examined asks the question in these terms.
- Whether any of the immunity-booster preparations marketed on this concept confer protection. The one controlled study found (AYURAKSHA, 36052011) reports lower IgG positivity in 101 kit users than in 71 non-randomised controls drawn from 47,827 recipients; its design cannot exclude selection and exposure differences, and it did not measure vyadhikshamatva. The larger Jaipur study (37303860) measured only acceptability and compliance.
- What the literature beyond the term itself contains. The construct-adjacent PubMed queries in searchLog (rasayana AND immunomodulation, 57 hits; prakriti AND immune AND ayurveda, 12; ojas AND ayurveda, 10; bala AND ayurveda AND immunity, 9) were counted and not screened, so this record cannot say whether a study operationalising host resistance under other Ayurvedic vocabulary exists.
- What Ashtanga Hridaya, Madhava Nidana and Sharngadhara say about vyadhikshamatva, bala or ojas. They were not retrieved and no citation to them is made.
- How Kaviratna's paragraph numbering maps onto the Sanskrit in Sutrasthana 11 beyond verse 36, the one verse checked there.
The terms this concept is built from
Each is a technical term in its own right. Where this site holds a lexicon entry for one, it is linked.
| Term | What it names |
|---|---|
| Vyadhi-bala-virodhitva | The aspect that opposes the strength of a disease already present, limiting its manifestation and progression. Chakrapani's commentarial gloss on Su. 28.7 (Ayurvedadipika, quoted in the classical section), not a distinction stated in Charaka's own text |
| Vyadhi-utpada-pratibandhakatva | The aspect that prevents a disease from arising at all. The second half of Chakrapani's two-part gloss on Su. 28.7; the same commentary glosses Charaka's vyadhi-sahani (disease-bearing bodies) as vyadhy-utpadaka-pratibandhakani, bodies that obstruct the producers of disease |
| Bala (sahaja) | Innate strength, inhering in the very nature of one's body and mind; constitutional |
| Bala (kalaja) | Strength dependent on stage of life and on season |
| Bala (yuktikrita) | Strength acquired through diet, exercise, regimen and rasayana; the modifiable component |
| Ojas | The essence of all seven dhatus. Sushruta identifies it with bala and marks this as his school's position (Su.Su. 15.19); Charaka seats it in the heart and makes its loss death (Ca.Su. 30.7-11). The sentence in Kaviratna's Charaka that calls ojas 'the strength of the body' rests on a variant line and is not relied on here |
| Ojo-visransa, vyapad, kshaya | Sushruta's three modes of ojas derangement: displacement from its seat, qualitative alteration through contact with vitiated doshas, and depletion; each is given a sign-list, and the last ends in death (Su.Su. 15.24) |
| Rasayana | The therapeutic class aimed at augmenting ojas, bala and longevity; the intervention arm of the concept |
| Vyadhi-sahatva / a-vyadhi-sahatva | Charaka's own paired terms at Su. 28.7 for bodies that bear disease (vyadhi-sahani) and bodies that do not (a-vyadhi-sahani); the text's vocabulary for the two poles of vyadhikshamatva |
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.
Charaka SamhitaSutrasthana 28 (Vividhashitapitiya):7 · checked against the source
na ca sarvani sharirani vyadhikshamatve samarthani bhavanti | ... sharirani chatisthulany atikrishany anivishtamamsashonitasthini durbalany asatmyaharopachitany alpaharany alpasattvani cha bhavanty avyadhisahani, viparitani punar vyadhisahani |
All bodies, again, are not equally liable to disease. ... 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.
The locus classicus of vyadhikshamatva. Note what it does and does not say: it gives a phenotypic checklist (body habitus, tissue adequacy, strength, diet quantity and suitability, vitality) and no mechanism, no agent and no internal process. The Sanskrit lists the unfit bodies as a series of compounds and this record assigns no count to them. The text's own terms for the two poles are a-vyadhi-sahani and vyadhi-sahani.
Charaka Samhita (Ayurvedadipika commentary of Chakrapanidatta)Sutrasthana 28 (Vividhashitapitiya):Charaka Samhita (Ayurvedadipika of Chakrapanidatta), Sutrasthana 28 (Vividhashitapitiya), verse 7, commentary notes 10 and 29 — not notes 9 and 28. Numbering: verse in Trikamji numbering (GRETIL unit Car_1,28.7); note numbers as printed in the GRETIL Caraka e-text with the Ayurvedadipika (Oliver Hellwig's input, based on the J. Trikamji ed., Chaukhambha Sanskrit Sansthan 1994, Kashi Sanskrit Series 228), which is the same frame of reference the citation's own verseNumbering field already pins itself to, and which prints the number AFTER each note. · checked against the source
Quotation withheld: no English translation of this passage has been cleared for reproduction, and the text held here is not the Sanskrit itself. The passage is at this address.
That the two-part analysis of vyadhikshamatva into opposing the strength of disease (vyadhi-bala-virodhitva) and obstructing the arising of disease (vyadhy-utpada-pratibandhakatva) is Chakrapani's gloss, in these words, and not Charaka's text. The commentary also glosses Charaka's 'disease-bearing bodies' as bodies that obstruct the producers of disease. Translation of the two Sanskrit sentences is this record's own.
Charaka SamhitaSutrasthana 28 (Vividhashitapitiya):7 · checked against the source
na hi sarvany apathyani tulyadoshani, na cha sarve doshas tulyabalah, na cha sarvani sharirani vyadhikshamatve samarthani bhavanti |
From several causes, the transgression committed by those who take food that is the reverse of beneficial, does not become injurious immediately. All kinds of food, again, that are not beneficial, are not equally injurious. Nor is the injury in every case of equal strength.
The immediate context of the vyadhikshamatva statement: it appears as the third of three variables in one Sanskrit sentence (not all unwholesome things are equally faulty; not all doshas are of equal strength; not all bodies are capable of resisting disease) that jointly determine whether and how severely disease results. Vyadhikshamatva is thus a host-susceptibility term inside a dose-response argument, not a standalone defensive system.
Charaka SamhitaSutrasthana 21 (Ashtauninditiya):3-4 · checked against the source
iha khalu shariram adhikrityashtau purusha nindita bhavanti; tadyatha- atidirghash cha, atihrasvash cha, atiloma cha, aloma cha, atikrishnash cha, atigaurash cha, atisthulash cha, atikrishash cheti ||3|| ... atisthulasya tavad ayusho hraso javoparodhah krichchhravyavayata daurbalyam daurgandhyam svedabadhah kshudatimatram pipasatiyogash cheti bhavanty ashtau doshah | tad atisthaulyam atisampuranad gurumadhurashitasnigdhopayogad avyayamad avyavayad divasvapnad dharshanityatvad achintanad bijasvabhavach chopajayate | ... ||4||
Referring to the body, there are eight persons that are regarded as worthy of condemnation. They are as follow: 1. one that is very tall in stature; 2. one that is very short in stature; 3. one that is very hairy; 4. one that is not at all hairy; 5. one that is very dark (or black) of complexion; 6. one that is very white of complexion; 7. one that is very corpulent or obese; and 8. one that is very emaciated or lean. Amongst these, of him that is very corpulent and him that is very lean, there are certain incidents, wanting in the others, that are especially worthy of condemnation. Of him that is very corpulent are these eight faults, viz., 1. diminution of the period of life, 2. (untimely) attack of decrepitude, 3. excessive difficulty of sexual congress, 4. weakness, 5. foetid smell in every part of the body, 6. excessive perspiration, 7. abnormal appetite for food, and 8. abnormal thirst. Excessive corpulence arises from taking excessive food, from habitual use of food that is heavy or sweet or cooling or oily, from want of physical exercise, from complete avoidance of sexual congress, from indulgence in sleep during the day, from constant joy, from the complete absence of mental exertion and anxiety, and from the nature of the seed from which one has taken one's birth.
The direct classical source for the ati-sthula and ati-krisha items in the Su. 28.7 checklist: both are already named as censurable constitutions, and the obese body's eight faults include daurbalya (weakness), one of the 28.7 criteria. The aetiology of obesity ends with bijasvabhava, the nature of the seed, after seven behavioural causes, so Charaka's own account of this habitus mixes a constitutional cause with modifiable ones; Kaviratna's 'heredity' is his gloss and is quoted as such.
Charaka SamhitaSutrasthana 21 (Ashtauninditiya):11-12 · checked against the source
seva rukshannapananam langhanam pramitashanam | kriyatiyogah shokash cha veganidravinigrahah ||11|| rukshasyodvartanam snanasyabhyasah prakritir jara | vikaranushayah krodhah kurvanty atikrisham naram ||12||
The habitual use of dry food and drink, fasts, insufficiency of food, excessive administration of purgatives and emetics, grief, suppression of the urgings of nature and sleep, habitual use of dry unguents and indulgence in baths without rubbing oil on the body, natural waste, or the waste that follows disease and excessive wrath, these make a man lean or emaciated.
The aetiology of the other censured habitus in the 28.7 checklist. The Sanskrit names prakriti (one's nature) and jara (ageing) as separate causes alongside diet, fasting, over-purgation, grief and anger; Kaviratna compresses the two into 'natural waste', so the constitutional items are clearer in the Sanskrit than in his English. Together with 21.4 this shows that the fat and lean bodies of 28.7 are, in Charaka's own account, products of both constitution and conduct.
Charaka SamhitaSutrasthana 21 (Ashtauninditiya):16-17 · checked against the source
satatam vyadhitav etav atisthulakrishau narau | satatam chopacharyau hi karshanair brimhanair api ||16|| sthaulyakarshye varam karshyam samopakaranau hi tau | yady ubhau vyadhir agachchhet sthulam evatipidayet ||17||
He that is very corpulent, and he that is very emaciated, both these are to be regarded as always diseased. They should, therefore, be always subjected to treatment (by administration of medicines and diet) that is calculated to reduce bulk and promote nutrition and growth. Among the two, viz., excessive corpulency and excessive emaciation, the latter is rather tolerable; for though the corpulent and the emaciated are equally situated, yet if disease assails both of them, it is sure to afflict the corpulent man more than the emaciated one.
That Charaka treats the two extreme habitus as standing conditions of disease (satatam vyadhitau), to be kept under continuous corrective regimen, and ranks obesity as the worse of the two when disease supervenes. This is the strongest statement in the chapter of what 28.7 asserts in passing: body habitus itself determines how disease falls on a person.
Charaka SamhitaSutrasthana 21 (Ashtauninditiya):18-19 · checked against the source
samamamsapramanas tu samasamhanano narah | dridhendriyo vikaranam na balenabhibhuyate ||18|| kshutpipasatapasahah shitavyayamasamsahah | samapakta samajarah samamamsachayo matah ||19||
That man the measure of whose growth is proportionate and whose limbs are symmetrical, is never, in consequence of the firmness or strength of his senses, overwhelmed by the force which diseases, (when they afflict him) put forth. He who succeeds in bearing hunger, thirst, and the heat of the sun, and in bearing also cold and physical labour, who can eat and digest agreeably to the vigor of his digestive fire, is seen to have a proportionate measure of growth.
The positive counterpart of the 28.7 checklist, and the nearest thing in Charaka's text to the first half of Chakrapani's gloss: the man of proportionate flesh and compact frame, with firm senses, 'is not overcome by the strength of diseases' (vikaranam na balena abhibhuyate). The criteria that identify him are again observable capacities: tolerance of hunger, thirst, sun, cold and exertion, even digestion and, in the Sanskrit, even ageing (samajarah, which Kaviratna does not render). Kaviratna's 'never' is his intensifier; the Sanskrit has the plain negative 'is not overcome'.
Charaka SamhitaSutrasthana 11 (Tistraishaniya):36 · checked against the source
trividham balam iti- sahajam, kalajam, yuktikritam cha | sahajam yach chharirasattvayoh prakritam, kalakritam ritu-vibhagajam vayah-kritam cha, yuktikritam punas tad yad aharacheshtayogajam ||36||
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.
The threefold classification of bala, and specifically that one third of it (yuktikrita) is modifiable by regimen. This is the classical warrant for the entire rasayana and immunity-booster literature. Kaviratna's parenthetical 'spices and liquors' has no counterpart in the Sanskrit, which says only ahara-cheshta-yoga (the conjunction of diet and activity).
Charaka SamhitaSutrasthana 30 (Arthedashamahamuliya):7-11 · checked against the source
tat parasyaujasah sthanam tatra chaitanyasangrahah | hridayam mahad arthash cha tasmad uktam chikitsakaih ||7|| ... yenaujasa vartayanti prinitah sarvadehinah | yad rite sarvabhutanam jivitam navatishthate ||9|| ... yasya nashat tu nasho 'sti dhari yad dhridayashritam | yach chharirarasasnehah prana yatra pratishthitah ||11||
The heart is the seat (or receptacle) of the foremost Ojas. ... All embodied creatures, vivified by the Ojas, move about or act. Without it, the life of all creatures becomes extinct. ... Without its loss or destruction, there can be no destruction (or death). 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.
That ojas is seated in the heart, that life depends on it, and that death is defined as its loss. This makes clear that ojas is a vital principle rather than a candidate immune parameter. The passage is NOT used here to establish that ojas is the substrate of bala: Kaviratna's sentence 'The Ojas is the strength of the body' renders the second line of 30.11, which he footnotes as read differently, and the Trikamji-based text has yach chharirarasasnehah ('that which is the unctuous essence of the body's rasa'), with no word for strength. The ojas-bala identification in this record rests on Sushruta Su. 15.19, not on this line.
Sushruta SamhitaSutrasthana 15 (Doshadhatumalakshayavriddhivijnaniya):19-20 · checked against the source
balalakshanam balakshayalakshanam chata urdhvam upadekshyamah | tatra rasadinam shukrantanam dhatunam yat param tejas tat khalv ojas tad eva balam ity uchyate, svashastrasiddhantat ||19|| tatra balena sthiropachitamamsata sarvacheshtasv apratighatah svaravarnaprasado bahyanam abhyantaranam cha karananam atmakaryapratipattir bhavati ||20||
Now we shall describe the characteristic features of the strength-giving principles of the body, as well as the symptoms that mark their loss or waste. 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." This view of oneness of vitality with protoplasmic albumen has been adopted in the present work. 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.
Sushruta's definition of ojas as the supreme essence (param tejas) of the dhatus from rasa to shukra, and his flat identification of it with bala: 'tad eva balam ity uchyate', which Bhishagratna renders 'identical with what is termed vital power'. The Sanskrit section heading is about bala (balalakshanam), so ojas enters as the answer to what strength is. The Sanskrit itself marks the identification as a school position, svashastrasiddhantat ('by the settled doctrine of our own system'), which Bhishagratna renders as 'This view ... has been adopted in the present work'; his footnote on dissenting authorities is thus anchored in the text's own hedge. 'Albumen' and 'protoplasmic' are his 1907 biomedical glosses and no part of the Sanskrit. The functions in 15.20 (firm and well-developed flesh, unimpeded activity, clear voice and complexion, sense organs performing their work) are the observable correlates of bala in this school.
Sushruta SamhitaSutrasthana 15 (Doshadhatumalakshayavriddhivijnaniya):21-22 · checked against the source
ojah somatmakam snigdham shuklam shitam sthiram saram | viviktam mridu mritsnam cha pranayatanam uttamam ||21|| dehah savayavas tena vyapto bhavati dehinah | tadabhavach cha shiryante sharirani sharirinam ||22||
Ojas (albumen being of a white colour belongs to the class of Somatmakam (cooling) substances. It is cooling, oleaginous, and firm (Sthira), contributes to the formation and growth of flesh, maintains its integrity or holds it firm, and is mobile or capable of moving about from one place to another within the organism. It is further soft and shiny, and is possessed of the most efficacious virtue and should be regarded as the most important element (seat) of vitality. The whole body with its limbs and members is permeated with Ojas, and a loss or diminution in its natural quantity leads to the gradual emaciation (and ultimate dissolution) of organism.
The qualities Sushruta assigns to ojas (lunar in nature, unctuous, white, cool, stable, mobile, clear, soft, smooth, the supreme seat of the pranas) and the statement that the body is pervaded by it and perishes in its absence. This is the passage behind the 'substance' reading in the contested section: ojas is given colour, texture and mobility like a material. Bhishagratna's clauses on 'formation and growth of flesh' and 'maintains its integrity' are not in 15.21 and appear to be carried over from the functions of bala in 15.20; his translation here expands the verse and is quoted as a translation, not as a verse-by-verse rendering.
Sushruta SamhitaSutrasthana 15 (Doshadhatumalakshayavriddhivijnaniya):23-24 · checked against the source
abhighatat kshayat kopach chhokad dhyanach chhramat kshudhah | ojah sankshiyate hy ebhyo dhatugrahananihsritam | tejah samiritam tasmad visramsayati dehinah ||23|| tasya visramso vyapat kshaya iti (trayo doshah;) lingani bhavanti ... ||24||
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. ... A deranged or vitiated albumen (Ojas) is characterised firstly by its dislodgment from its proper seat or locality (Visransha), secondly, by a change or modification of its native virtues in contact with the deranged humours or disordered organs (Vyapad) and thirdly, by wasting away (Kshaya).
The causes of ojas depletion, which explicitly include mental states (kopa anger, shoka grief, dhyana brooding, which Bhishagratna renders 'cares and anxieties') alongside trauma, wasting disease, fatigue and hunger; and the threefold classification of ojas derangement.
Sushruta SamhitaSutrasthana 15 (Doshadhatumalakshayavriddhivijnaniya):24 and 28 · checked against the source
lingani bhavanti sandhivishlesho gatranam sadanam doshachyavanam kriyasannirodhash cha visramse, stabdhagurugatrata vatashopho varnabhedo glanis tandra nidra cha vyapanne, murchchha mamsakshayo mohah pralapo maranam iti cha kshaye ||24|| ... tatra visramse vyapanne cha kriyavisheshair aviruddhair balam apyayayet; itaram tu mudhasanjnam varjayet ||28||
The first of the preceding properties (dislodgment) gives rise to such symptoms as looseness of the bone-joints, numbness of the limbs, dislodgment of the deranged humours from their respective receptacles and suppression of the (bodily and intellectual) functions. To the second of the foregoing properties, (change or modification of its natural virtue through contact with the deranged bodily humours etc) should be ascribed such symptoms, as 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. The third property of the deranged albumen, (loss or wasting), brings on fits of fainting, loss of flesh, stupor, delirium and ultimately death. ... 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.
That each member of the ojas-derangement triad has its own sign-list in the text (loosened joints, lassitude and arrested function for visransa; stiffness, heaviness, vata-swelling, discolouration, malaise and drowsiness for vyapad; fainting, loss of flesh, confusion, delirium and death for kshaya); that the remedy for the first two is to replenish bala (balam apyayayet, which Bhishagratna renders as rejuvenating elixirs); and that the patient who has lost consciousness from kshaya is to be given up as incurable. The signs are clinical and observational and nothing in them is a measurement.
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.
A short review on deciphering Vyadhikshamatva: insights from HLA-B27-ankylosing spondylitis relation. · J Complement Integr Med · 2024 · PMID 38702944
A review correlating vyadhikshamatva, ojas, bala and prakriti with the HLA-B27 to ankylosing spondylitis association, surveying the arthritogenic peptide, misfolding, surface homodimer and beta-2 microglobulin hypotheses.
How much it shows. Narrative review, explicitly indexed as such. It restates classical doctrine alongside an unrelated immunogenetic literature and proposes a correspondence; it presents no data, tests nothing, and the HLA-B27 hypotheses it surveys are about disease mechanism, not about any Ayurvedic construct. This is the archetype of the pattern noted in this project's reconnaissance: classical doctrine in modern vocabulary, a proposed correlate, and no empirical step.
Can cholesterol and its products serve as biomarkers for ojas? · J Ayurveda Integr Med · 2025 · PMID 41289791
Proposes cholesterol and its products (steroid hormones, bile acids, vitamin D, myelin) as candidate biomarkers for ojas, building on a 1995 proposal, and argues five correspondence links including that cholesterol immunometabolism and vitamin D regulate immunity, which is aligned with vyadhikshamatva.
How much it shows. A hypothesis paper. The authors are explicit that the links are 'correlative, potentially causal' and that they are proposing candidate biomarkers. No measurement of ojas was made, no prediction was tested, and the argument proceeds by matching described properties to known cholesterol biology. It is a clear and honest example of the biomarker-as-future-work pattern rather than a source of evidence.
Role of Kasahara Dashemani Vati in Kasa and Vyadhikshamatva in children with special reference to recurrent respiratory tract infections. · Ayu · 2013 · PMID 24501524
A single-centre randomised controlled trial in 40 children aged 3-12 with recurrent respiratory tract infections, comparing Kasahara Dashemani Vati with Indukanta Vati over 60 days, with immunoglobulin biomarkers and recurrence during follow-up among the outcomes, and vyadhikshamatva as a named endpoint.
How much it shows. Small (n=40 split between arms), single-centre, and comparing two active Ayurvedic preparations with no placebo or standard-care arm, so any observed improvement cannot be separated from natural history in a condition that remits spontaneously. Notable mainly as one of the few records found in this entry's searches that attempted to operationalise vyadhikshamatva as a measurable endpoint at all, and that operationalisation was ad hoc.
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
Observational study of an Ayurveda immunity booster kit (Chyawanprasha plus two vyadhikshamatva preparations) distributed to 1,714 frontline workers in Jaipur during COVID-19, assessing acceptability, palatability, safety and compliance.
How much it shows. Observational, uncontrolled, and framed by its own authors as an assessment of compliance and acceptability rather than of prevention. Any inference about protection is unsupported: there was no comparison group, no randomisation, and exposure risk was not measured. It illustrates how a concept with no validated measure gets used as a product category.
Pathophysiology of Covid-19 and host centric approaches in Ayurveda. · J Ayurveda Integr Med · 2022 · PMID 33519134
Review mapping COVID-19 pathophysiology onto Ayurvedic categories, attributing abnormal immune responses in COVID-19 to abnormalities of tridosha, rakta and ojas, and proposing host-centric strategies of agni-bala conservation and marma protection.
How much it shows. Narrative review with no data. It is an act of translation, recasting a described biomedical pathophysiology in Ayurvedic vocabulary, and the proposed strategies are presented as hypotheses. Useful as documentation of how the ojas-immunity equation is made in practice, not as evidence for it.
AYURAKSHA, a prophylactic Ayurvedic immunity boosting kit reducing positivity percentage of IgG COVID-19 among frontline Indian Delhi police personnel: A non-randomized controlled intervention trial. · Front Public Health · 2022 · PMID 36052011
A non-randomised controlled intervention trial of the AYURAKSHA kit (Sanshamani Vati, AYUSH Kadha and Anu Taila) among Delhi police personnel during COVID-19. After 80,000 kits were distributed among 47,827 participants, a trial group of 101 was compared with 71 controls on COVID-19 IgG positivity and an Immune Status Questionnaire as primary outcomes; IgG positivity was 17.5% in the trial group against 39.4% in controls (p = 0.003), with quality-of-life and haematological measures as secondary outcomes. Registered CTRI/2020/05/025171.
How much it shows. The only controlled study found in this entry's searches, and the one that most nearly tests a protection claim, which is why it is added in revision. It is non-randomised; the 172 people analysed are a self-selected fraction of 47,827 recipients, so uptake, exposure and testing behaviour may differ between arms; IgG positivity stands in for infection; no blinding is reported. It evaluates a product marketed on the concept and does not measure vyadhikshamatva, which was not operationalised. Added from the PubMed abstract retrieved 2026-10-06; the full text was not read for this entry.
How to cite this entry
Age Ayurveda Nighantu, Vyadhikshamatva: resistance to disease
, https://nighantu.ageayurveda.com/concept/vyadhikshamatva/,
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Data exported 2026-10-08.
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.