ojas: what the term means and how it is translated
ojas ओजस् is an Ayurvedic technical term. It is rendered into English in 9 different ways, which is the reason this page exists: the renderings do not agree, and the difference between them changes what the term is taken to mean.
| Transliteration | ojas |
|---|---|
| Devanagari | ओजस् |
| Also written | oja, ojus, ojah (in sandhi, ojaḥ), bala (used as a near-synonym in some passages) |
| Category, as gathered | dhatu |
| Grouped here under | Body: tissues, wastes and channels |
| Classical citations | 7 |
| Citations checked | 2026-10-08 |
How it is translated, and whether the translation holds
Each rendering is given with the source that uses it. The assessment is ours.
Ojas
WHO International Standard Terminologies on Ayurveda (2022) · ITA-2.2.25 · standard
WHO declines to translate the term and keeps the Sanskrit as the English headword. Its description: 'The essence of seven fundamental structural components: vital for life, providing strength and resistance to disease and supporting mental function.' The decision not to translate is itself the datum.
Reproduced unaltered and attributed from the WHO International Standard Terminologies on Ayurveda, which is what that licence permits. It is deliberately absent from the downloadable dataset, which is offered under CC BY 4.0 and invites the modification a NoDerivs licence forbids.
The essence of all seven Dhātus, that is vital for life. Also indicates Bala (immunity).
National Institute of Ayurveda, WHO-APW project terminology list · entry SK0134, ojas · standard
COMPARATOR. Also the only standard-type source retrieved that records the para/apara division and the ten attributes.
Reproduced unaltered and attributed from the WHO International Standard Terminologies on Ayurveda, which is what that licence permits. It is deliberately absent from the downloadable dataset, which is offered under CC BY 4.0 and invites the modification a NoDerivs licence forbids.
vital power
Sushruta Samhita tr. Kaviraj Kunja Lal Bhishagratna (1907) · Sūtrasthāna ch. 15 · translation
Public domain and quotable.
albumen
Sushruta Samhita tr. Kaviraj Kunja Lal Bhishagratna (1907) · Sūtrasthāna ch. 15, used throughout as the parenthetical gloss · translation
Public domain but a period artefact of Victorian physiology. Bhishagratna's own footnote concedes 'The Sanskrit term Ojas has a variety of meanings' and that several authorities reject the identification.
protoplasmic albumen / protoplasmic matter as found in cells (Vindus)
Sushruta Samhita tr. Kaviraj Kunja Lal Bhishagratna (1907) · Sūtrasthāna ch. 15, translator's footnote · translation
Public domain. Bhishagratna's primary gloss, distinct from 'albumen' which he calls the secondary sense.
strength-giving principle
Sushruta Samhita tr. Kaviraj Kunja Lal Bhishagratna (1907) · Sūtrasthāna ch. 15 · translation
the element called Ojas
Charaka Samhita tr. Avinash Chandra Kaviratna (1896-1913) · Sūtrasthāna 17, passim · translation
Public domain. Kaviratna leaves the term untranslated and calls it a dhātu/element; in his footnote to Śārīrasthāna 7 he calls it 'the blood of blood, the most vital dhatu in the body'.
Diminution of ojas (ojakṣayaḥ)
WHO International Standard Terminologies on Ayurveda (2022) · ITA-5.3.34 · standard
WHO also gives Dislodgement of ojas (ojovisramsaḥ, ITA-5.3.35), Derangement of ojas (ojovyāpat, ITA-5.3.36), Disproportion of ojas (ojovaiṣamyam, ITA-5.3.33), Excess formation of ojas (ojovṛddhiḥ, ITA-5.3.37) and Unwholesome to ojas (anaujasyam, ITA-6.2.6.63).
Reproduced unaltered and attributed from the WHO International Standard Terminologies on Ayurveda, which is what that licence permits. It is deliberately absent from the downloadable dataset, which is offered under CC BY 4.0 and invites the modification a NoDerivs licence forbids.
vital essence / vigour / immunity / bio-strength
common English-language Ayurveda literature · other · our paraphrase of the source, not its words
All in wide use, none traceable to a standard. See mistranslations.
The classical passages
Each citation gives its address so a reader can check it in a printed edition, our account of what the passage establishes, and the result of reading it against its source.
Sushruta SamhitaSūtrasthāna 15:not numbered in Bhishagratna · 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."
Ojas as the essence (sāra) of all seven dhātus from rasa to śukra. Secondary sources cite this as Su.Sū.15/19; Bhishagratna's text is unnumbered, so the verse number is not verified here.
Sushruta SamhitaSūtrasthāna 15:not numbered in Bhishagratna · checked against the source
Ojas (albumen) being of a white colour belongs to the class of Somátmakam (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.
The physical attributes of ojas: white, saumya, śīta, snigdha, sthira, and mobile. The combination of sthira and mobile is what PMID 41289791 seizes on to argue for a lipid.
Sushruta SamhitaSūtrasthāna 15:not numbered in Bhishagratna · checked against the source
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 (Vyápad) and thirdly, by wasting away (Kshaya).
The threefold ojo-doṣa: visraṃsa, vyāpad, kṣaya. This is the classical basis for WHO ISTA entries ITA-5.3.34, 5.3.35 and 5.3.36, and the mapping is clean.
Charaka SamhitaSūtrasthāna 17 (Kiyantaḥ Śirasīya):Kaviratna's v.74 · checked against the source
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.
Charaka's characterisation of ojas as a slightly yellowish pure blood resident in the heart, whose loss is fatal. Note this differs from Sushruta's white and cooling ojas; the two texts do not agree on its colour.
Charaka SamhitaSūtrasthāna 17:Kaviratna's v.114 · checked against the source
When the phlegm changes its normal condition, it becomes those impurities that are evacuated by the system. 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.
The identification of normal ślesman with ojas, which is the textual root of the 'ojas is a form of kapha' position and of the term ślaiṣmika ojas. Charak Samhita Online cites this same statement as Ca.Sū.17/117; Kaviratna numbers it 114.
Charaka Samhita with Cakrapāṇidatta's ĀyurvedadīpikāSūtrasthāna 28:commentary on v.4, Cakrapāṇi's segment 34 · checked against the source
atra yadyapyojaḥ saptadhātusārarūpaṃ tena dhātugrahaṇenaiva labhyate tathāpi prāṇadhāraṇakartṛtvena pṛthak paṭhitaṃ ye tu śukrajanyamoja icchanti teṣāmaṣṭamo dhāturojaḥ syāditi
Cakrapāṇi states that although ojas is the essence of the seven dhātus and so is already included when the dhātus are named, it is listed separately because it sustains prāṇa; and that for those who hold ojas to be produced from śukra, ojas would be an EIGHTH dhātu. The eighth-dhātu question is thus explicitly a contested position, not a settled doctrine.
Sushruta SamhitaSūtrasthāna 14:translator's footnote, not numbered · checked against the source
Semen, like gold a thousand times purified, casts off no dregs. Hence certain authorities hold albumen (protoplasmic matter) to be the eighth or the culminating principle of the body.
Independent confirmation, in a public-domain English source, that the eighth-dhātu status of ojas is attributed to 'certain authorities' rather than being the standing view. This is Bhishagratna's footnote, not mūla text.
The concept record for this term
A term entry answers what the word means. It does not answer whether the thing the word names is settled, and often it is not. That is what the concept record is for: it sets out the questions on which the sources disagree about this term, with each position attributed, and states what is not established.
Where this term does work in the theory
One concept record names this term as one of its components, and glosses it there as follows.
- Vyadhikshamatva: resistance to disease as 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
Not to be confused with
- bala
- WHO gives bala a separate entry (ITA-2.2.27, 'Immunity, strength, physical endurance') with three subtypes. Ojas and bala are closely linked in the texts but are not the same term, and the NIA list says ojas 'also indicates Bala', which is a gloss, not an identity.
- vyādhikṣamatva
- Resistance to disease; WHO pairs it with bala at ITA-2.2.27. It names a capacity; ojas names a substance said to underlie it.
- kapha / ślesman
- Ca.Sū.17 (Kaviratna's v.114) says normal ślesman is called ojas, and Gangādhara read a variant at Ca.Śā.7 as 'the particular kind of phlegm known as ojas'. Kaviratna rejects that reading outright: 'This can be hardly correct ... It is not regarded as any kind of phlegm.' A live classical disagreement, not a translation problem.
- śukra
- Ojas is said by some to be produced from śukra, which would make it the eighth dhātu; Cakrapāṇi records this as one position among others.
- dhātu-sāra
- Sāra is the excellence of any individual dhātu, assessed per tissue. Ojas is the single essence of all seven taken together.
- prāṇa
- Ojas is listed among the ten āyatanas of prāṇa in Ca.Sū.29 (Kaviratna: 'the blood, the semen, ojas'), which makes it a substratum of prāṇa, not prāṇa itself.
Renderings that do not hold
- albumen. Bhishagratna's own 1907 rendering, and the one most likely to be copied from a public-domain text without noticing its date. It equates ojas with a specific protein class on the strength of Victorian protoplasm theory. Bhishagratna's footnote already flags that authorities disagreed.
- immunity. Reduces ojas to one of its functions. WHO deliberately does not translate the term, and assigns 'immunity' to bala/vyādhikṣamatva instead (ITA-2.2.27).
- vitality / life force / vital energy. Assimilates ojas to prāṇa-type vitalism. The classical descriptions are consistently of a material substance with colour, taste, smell, quantity and a location, not of an energy.
- essence of the seven tissues, therefore semen. Conflates ojas with śukra by running the dhātu sequence one step too far. Cakrapāṇi records that as a minority position which would make ojas an eighth dhātu.
Open questions
Recorded rather than resolved. Each one is something this entry cannot currently settle.
- Charaka calls ojas slightly yellowish and heart-resident; Sushruta calls it white and body-pervading. Neither public-domain translator reconciles them, and no retrieved source treats the disagreement as anything but a footnote. It deserves its own contested entry.
- Whether ojas is the eighth dhātu. Cakrapāṇi and Bhishagratna both record it as a contested position; no source retrieved settles it.
- Kaviratna's verse numbering in Sūtrasthāna 17 diverges from modern editions (his v.114 versus the commonly cited 17/117). The whole chapter's offset needs checking.
- ICD-11 TM2 (Chapter 26, Module 2, released on the ICD-11 browser February 2025) classifies disorder patterns, not physiological concepts. No TM2 code for ojas or its disorders was verified. Recorded as unverified, not as absent.
How to cite this entry
Age Ayurveda Nighantu, ojas
, https://nighantu.ageayurveda.com/lexicon/ojas/, CC BY 4.0.
The whole lexicon is downloadable from the index.
Machine-readable source: Markdown.
Data exported 2026-10-08.
Educational reference only. A term entry explains what a word means and how it has been translated. Nothing here is advice, and nothing here describes how any condition should be treated.