Age Ayurveda Nighantu

Dhatu Formation and the Three Models of Tissue Nutrition

How much weight this concept bears. This concept rests on classical exegesis. The seven-tissue sequence and the prasada and kitta split are stated plainly in both Charaka and Sushruta, and the upadhatu and mala of each stage are stated in Charaka, so the doctrine is well attested as doctrine. What it lacks is measurement. Nothing retrieved for this record reports a rate at which any tissue is converted into any other, identifies a dhatvagni with an enzyme, organelle or pathway, or describes an experiment that could discriminate between kshira-dadhi, kedari-kulya and khale-kapota; the three models make no differing predictions that any retrieved author has stated in testable form. The searches behind those statements are bounded and named: PubMed esearch on 2026-10-06 for 'dhatu poshana' returned 55 records and all 55 titles were screened; 'dhatvagni' returned 2; 'khale kapota' returned 1 (PMID 32855015); 'kedari kulya' returned 0. Four search strings on one date is not a systematic review and will not support a claim that no such study exists anywhere. Within that set, four of the five references carried here are non-empirical, three narrative or conceptual reviews and one hypothesis paper. The fifth, PMID 24250128, is a randomised placebo-controlled trial of 46 patients whose rationale runs through rakta-dhatvagni, but its endpoints are haematological and the dhatvagni premise is assumed rather than measured, so it does not test the doctrine either. On the commentarial side the three nyayas are not scriptural: searches for kedari, kulya, kapota, khale and dadhi across the full retrieved text of both public-domain translations return only unrelated hits, drug names, pigeon flesh, snake species and colour terms, and none in a tissue-nutrition context, so the nyaya names are absent from the mula texts in these translations and the terminology is attributed by the secondary literature to the medieval commentators. A caution about that secondary literature: papers on these models routinely assert correspondences to absorption, circulation and cellular metabolism, and PMID 26664231 is carried here as a named example, proposing dhatu siddhanta as a probable predecessor of stem cell therapy. Those are restatements of classical doctrine in modern vocabulary, not findings. The honest summary is that dhatu formation is a coherent and internally detailed physiological narrative, disputed at its own foundation on the question of how many fires drive it, with no independent empirical support and no validated modern correlate in the literature retrieved here.

Ayurvedic physiology holds that food, once digested by jatharagni, yields a nutrient essence (ahara rasa) that is progressively converted into seven bodily tissues (dhatu) in a fixed order: rasa, rakta, mamsa, medas, asthi, majja, shukra. Each conversion is said to be driven by a tissue-specific fire (dhatvagni) and to yield two fractions, a usable portion (prasada) and a waste portion (kitta). Both samhitas assert the sequence, the fire-driven conversion and the prasada and kitta split, and Charaka also names the secondary tissue and the waste product belonging to each stage; neither names a mechanism. How many fires there are, and whether agni is anything other than pitta, is disputed inside the tradition rather than settled by it. The three named nutrition models (kshira-dadhi, kedari-kulya, khale-kapota) do not occur in the mula texts of either samhita as translated by Kaviratna or Bhishagratna; the secondary literature attributes the terminology to the medieval commentators, and no commentary passage for any of the three has been retrieved for this record. Kshira-dadhi (milk-to-curd) reads the sequence as complete serial transformation; kedari-kulya (field-and-irrigation-channel) reads it as a nutrient stream distributed through channels to tissues in order; khale-kapota (threshing-floor-and-pigeons) reads it as each tissue drawing selectively from a common pool. On how long the cycle takes, the texts give figures that are not directly comparable and neither is offered as an observation: Charaka reports, as the view of 'some', six days and nights for one dhatu to become the next, while Sushruta gives 3,015 kalas for each stage and a month for the whole chain, with a month defined in the same chapter as 18,090 kalas. The familiar 'five days per dhatu' is not a statement of either text. It is Bhishagratna's own conversion, printed in his brackets as 'according to our modern computation', and it holds only if the month is taken as thirty days.

At a glance
Subject areaHow the body is held to work
Domain, as recordedAyurvedic physiology (sharira kriya)
Contested questions6
Stated as not known15
Classical citations14, 14 quoting the text
Research papers assessed5
Citations checked2026-10-08

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.

How long does the full transformation from rasa to shukra take, and do the two texts actually disagree?

This is contested.

  1. Charaka Chikitsasthana 15.21 (Kaviratna's 20) reports, as the opinion of 'some', six days and nights for the transformation of ONE dhatu into the next. The figure is per step, and the disciple's objections follow immediately, so it is presented as a held view rather than as settled doctrine.
  2. Sushruta Sutrasthana 14 gives 3,015 kalas for each stage and a month for the whole chain, and the same chapter defines a month as 18,090 kalas, which is six times 3,015.
  3. The familiar 'five days per dhatu' is not in either text. It is Bhishagratna's bracketed conversion, marked in his own translation as 'according to our modern computation'. It follows arithmetically from 3,015 of 18,090 kalas if a month is taken as thirty days, but the text states no absolute length for a kala and performs no such conversion.
  4. The record previously set Charaka's six days against Sushruta's one month and called them conflicting. That comparison was between a per-step figure and a whole-chain figure. Compared per step the two come out at six days against five, which is a narrower disagreement than the record claimed; compared over the chain, six days a step would run to about thirty-six days. Whether that is a real disagreement, two different quantities, or two measurement conventions is not resolved by either text.
  5. Later and secondary literature circulates other figures, commonly 'about a month' or 'six days', without resolving the question. No text offers an observation supporting any number.

Is agni a single principle identical with pitta, and how many dhatvagnis are there?

This is contested.

  1. Charaka Chikitsasthana 15.13-15.14 numbers the fires as five, elemental; two aphorisms later, at 15.16, it speaks of seven, tissue-level, without explaining the change. Kaviratna's own footnote at that place concedes the difficulty in as many words: 'This sudden mention of seven fires after having numbered them as five, requires explanation.' The reason he then supplies is his, not the text's.
  2. Bhishagratna's Introduction reports Sushruta as holding 'that the Pittam is the only fire present in the system', which if taken strictly leaves no dhatvagni as a separate agent at all.
  3. The same passage reports that 'Agnivesha and certain sections of the Ayurvedic Acharyayas hold that there are five Anjali-fuls of Agni in the human organism', a quantity rather than a count of fires, and Bhishagratna reconciles it with pitta only by his own device.
  4. Arunadatta, commenting on the Ashtanga Hridaya and reported in the same passage, 'holds that there are as many Dhatvagnis as the constituents of the body', which abandons the number seven.
  5. PMID 22131747 records the thirteen-fold scheme, one jatharagni with five bhutagni and seven dhatvagni, as the standard modern presentation, and also documents that the identity of agni with pitta is itself disputed inside the tradition.
  6. All of the above except the Charaka aphorisms reach this record through a translator's Introduction or a modern review. No commentary text stating any of these positions has been retrieved, so the positions are reported, not sourced to the commentators themselves.

Are the three nyayas competing explanations or complementary aspects of one process?

This is contested.

  1. The dominant modern reading (PMID 32855015) treats them as complementary: kshira-dadhi describes transformation, kedari-kulya describes transport, khale-kapota describes selective uptake.
  2. A stricter reading treats kshira-dadhi as literal serial conversion, in which case it is incompatible with khale-kapota's parallel selective uptake from a shared pool, since they cannot both describe the same instant.
  3. Some authors treat the nyayas as pedagogical analogies rather than mechanistic claims at all, in which case the question of compatibility does not arise.

Is nutrient supply to tissues sequential or simultaneous?

This is contested.

  1. Serial reading: rasa must become rakta before rakta can become mamsa, implying a delay proportional to position in the chain.
  2. Charaka Chikitsasthana 15.36 (Kaviratna's 35) states that rasa is diffused through every part of the body simultaneously by vyana vayu, which is the textual basis for a simultaneous model and for the explanation of immediate drug effects.

Is ojas an eighth dhatu produced at the end of the chain?

This is contested.

  1. Bhishagratna's explanatory footnote to Sushruta Sutrasthana 14 records that 'certain authorities hold albumen (protoplasmic matter) to be the eighth or the culminating principle of the body', produced from the thin fraction of shukra. This is in his footnote and not in the text he is translating, it names no authority, and 'albumen' and 'protoplasmic matter' are his renderings; it is reported here as a translator's note, which is all it is.
  2. The standard enumeration in both samhitas stops at seven dhatus and treats ojas as the essence (sara) of all of them rather than as a further member of the sequence.

Does the three-fold resolution of each stage belong to the texts, to Dalhana, or to the translator?

This is contested.

  1. The secondary literature attributes to Dalhana the analysis in which each stage resolves into a sthula or excreted fraction, a condensed fraction that maintains the tissue, and a sukshma fraction that becomes the next tissue.
  2. The only retrieved statement of it is Bhishagratna's own footnote at Sutrasthana 14, which runs the three-factor resolution through every stage from rasa to shukra but names no commentator.
  3. Charaka Chikitsasthana 15.16-15.19 states a two-fold resolution, prasada and kitta, and separately names the upadhatu of each stage. Whether the three-fold scheme is a commentator's refinement of that or a later reorganisation of it is not settled by anything this record has retrieved.

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 measured rate of conversion of any dhatu into any other was found. The searches behind that statement are bounded and named: PubMed esearch on 2026-10-06 for 'dhatu poshana' (55 records, all titles screened), 'dhatvagni' (2 records), 'khale kapota' (1 record) and 'kedari kulya' (0 records). None of the screened records reports such a measurement. This does not establish that no such study exists outside those four search strings.
  • No enzyme, transporter, organelle or metabolic pathway has been identified with any of the seven dhatvagnis in the literature retrieved here; the correspondences offered in the review articles cited are analogies, not assays.
  • No experiment has been designed, among the sources retrieved, that would distinguish kedari-kulya from khale-kapota, and no author in them states what observation would falsify either.
  • The earliest datable source of the three nyaya names is not established. The names are absent from the mula texts as translated by Kaviratna and Bhishagratna; secondary literature points variously to Dalhana, to Chakrapanidatta and to the Bhavaprakasha Purva Khanda, and no commentary or nighantu passage naming any of them has been retrieved, so none of those attributions is carried as a citation here.
  • Meulenbeld's A History of Indian Medical Literature is the reference that would settle which commentator originates which nyaya, and it was not consulted. The attribution question above stays open for that reason and not because the question is unanswerable.
  • The thirteen-agni enumeration, one jatharagni with five bhutagni and seven dhatvagni, is carried here only from the mula-text aphorisms that state its three parts separately (Charaka Chikitsasthana 15.13-15.14, 15.16 and 15.39) and from PMID 22131747. The enumeration is widely attributed to Chakrapanidatta commenting on Charaka Chikitsasthana 15, and no text of that commentary has been retrieved, so the attribution is not asserted and no verse is cited for it.
  • Whether 'rasa' denotes plasma, chyle, lymph, interstitial fluid, or a composite of these is not settled, and the choice changes every downstream correspondence.
  • The upadhatu and mala correspondences are now cited to mula text (Charaka Chikitsasthana 15.17-15.19) but they are stated there, not explained: the text gives no reason why bone should yield hair or rasa yield phlegm, and nothing retrieved here examines the question.
  • One of those correspondences is textually unsettled in the translation this record quotes. Kaviratna divides the last pair as marrow yielding an oily substance and skin yielding the eye secretions, while secondary renderings of the same aphorism assign the oily eye and skin secretion to majja. No standard Sanskrit edition was retrieved to adjudicate, so the record quotes Kaviratna as printed and relies on neither division.
  • Sushruta's kala is defined in this chapter only as one part in 18,090 of a month. No independent definition of its absolute length was found, so 'five days per dhatu' holds only on the assumption that the month in question is thirty days.
  • It is not known whether Charaka's reported six days a step and Sushruta's 3,015 kalas a stage reflect two different processes, two measurement conventions, or simple disagreement.
  • Vagbhata's compressed restatement of tissue increase and decrease at Ashtanga Hridaya Sutrasthana 11 is not covered here. No public-domain English translation of the Ashtanga Hridaya was located, and this project does not quote in-copyright translations, so nothing from Vagbhata is quoted or cited in this record even though the chapter is a real locus for the material.
  • Fetal dhatu formation is out of this record's scope. Charaka Sharirasthana and Sushruta Sharirasthana 4, which Bhishagratna's own contents page describes as treating 'the development of Factors in the womb as well as the Factors which contribute to the growths of its different bodily organs and principles', were not worked through. The one prenatal passage cited here (Sushruta Sharirasthana 3, section 17) is included for the transudation mechanism only and the record makes no claim to cover embryonic tissue formation.
  • Dwarakanath's Digestion and Metabolism in Ayurveda (1967), the standard monograph on exactly this subject, was not consulted; it is in copyright and no retrievable copy was found. This record therefore does not represent the scholarship on dhatu formation, only the sources it could retrieve and quote.
  • No biological correlate of the dhatu chain was found. The nearest body of work in this field, the Ayurgenomics literature, addresses prakriti, that is constitutional classification, rather than tissue nutrition, and no study was retrieved that tests any step of dhatu poshana against a measurement. That literature is not cited here because it would be cited for a question it does not ask.

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.

TermWhat it names
Ahara rasa The nutrient essence extracted from digested food; the input to the whole tissue chain.
Jatharagni The central digestive fire in the gut, held to be the root on which all other fires depend.
Bhutagni Five elemental fires; each is said to digest the corresponding elemental fraction of food (earthy, watery, fiery, airy, ethereal).
Dhatvagni Seven tissue-level fires, one per dhatu, that 'cook' the incoming nutrient into that tissue. The seven-fold count is what Charaka Chikitsasthana 15.16 states, but how many such fires there are, and whether any fire exists in the body distinct from pitta, is disputed: Bhishagratna's Introduction has Sushruta holding pitta to be the only fire and Arunadatta holding that there are as many dhatvagnis as there are body constituents. See the contested entry on dhatvagni.
Prasada and kitta The two products of each tissue-level cooking: the usable refined portion and the waste portion (e.g. kapha from rasa, pitta from rakta, sweat from medas).
The seven dhatus in order Rasa (plasma/chyle), rakta (blood), mamsa (flesh), medas (fat), asthi (bone), majja (marrow), shukra (reproductive tissue).
Kshira-dadhi nyaya 'Milk-into-curd' analogy: the law of transformation. Each dhatu is wholly converted into the next, so nourishment is strictly serial.
Kedari-kulya nyaya 'Field-and-irrigation-channel' analogy: the law of transmission. A common nutrient stream is carried through channels (srotas) and fills each tissue-field in turn.
Khale-kapota nyaya 'Threshing-floor-and-pigeons' analogy: the law of selection. Each tissue draws what it specifically needs from a shared nutrient pool, at its own rate and distance.
Eka-kala dhatu poshana nyaya A fourth model, of simultaneous nourishment, invoked to explain immediate whole-body effects; it corresponds to the classical statement that rasa is diffused everywhere at once by vyana vayu.
Upadhatu and mala Secondary tissues and the excretory by-product of each stage. Charaka Chikitsasthana 15.17-15.19 names them: milk and menstrual blood from rasa, vessels from rakta, fat and the six skins from mamsa, tendons and muscles from medas; and phlegm from rasa, bile from rakta, the body filths from mamsa, sweat from medas, hair from asthi. The assignment of the oily eye and skin secretion is where Kaviratna's English and the standard reading diverge; see notKnown.

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 SamhitaChikitsasthana 15 (Treatment of Diseases of the Grahani):14-15 as printed by Kaviratna; standard (Trikamji) 15.15-15.16 · corrected against the source

They who sustain the body, viz., the 'dhatus' (i. e., 'Rasa' or juice, blood, flesh, adeps, marrow, bones, and vital seed), are cooked by their seven respective fires. This process of cooking which they undergo is of two kinds in consequence of the 'Kitta' (refuse) and the 'Prasada' (pure substance) which results from it. From 'Rasa' (juice) arises blood; from blood is flesh; from flesh is adeps; from adeps is bone; from bone is marrow; from marrow is vital seed: from the vital seed arises the foetus.

tr. Avinash Chandra Kaviratna (1896-1913)

The seven-fire model and the prasada/kitta split, and the canonical serial order of tissue derivation, stated in a lawfully quotable public-domain English translation.

source

Charaka SamhitaChikitsasthana 15:20 as printed by Kaviratna; standard (Trikamji) 15.21 · corrected against the source

Some are of opinion that the transformation (of one 'dhatu' into another) takes place in six days and nights. Of food and the 'dhatus' this transformation goes on eternally like (the motion of) a wheel.

tr. Avinash Chandra Kaviratna (1896-1913)

That Charaka reports a transformation period as the opinion of 'some' rather than as settled doctrine, and that the figure given is six days and nights for ONE dhatu becoming the next, not for the whole chain. The disciple's objections follow immediately, which is why the record treats it as a reported opinion.

source

Charaka SamhitaChikitsasthana 15:12-13 as printed by Kaviratna; standard (Trikamji) 15.13-15.14 · corrected against the source

Since the five heats, viz., that appertaining to earth, that to water, that to fire, that to air, and that to ether, digest earth and the other properties, respectively, numbering five, of the food eaten, Therefore, the material properties in the body (that is, those that relate to the five material substances already named) are nourished, respectively, by their correlative elements. The earthy properties (in food) nourish the earthy elements in the body. The rest nourish the rest, in detail.

tr. Avinash Chandra Kaviratna (1896-1913)

The bhutagni (five elemental fires) layer, and the like-nourishes-like principle operating at the elemental level beneath tissue formation.

source

Charaka SamhitaChikitsasthana 15:16-18 as printed by Kaviratna; standard (Trikamji) 15.17-15.19 · checked against the source

As regards women, from 'Rasa' are both milk and blood ; from blood are ducts large and small ; from flesh is fat or adeps and six varieties of skin ; and from adeps is the origin of the tendons and muscles. The above are the transformations of 'Prasada.' That which is called the 'Kitta' (refuse) of the food taken, consists of stools and urine ; the 'Kitta' of 'Rasa' is phlegm ; that of blood is bile ; that of flesh are the filths of the body, including the secretions (from the nose, the ears, &c.) ; while swea[t] forms the 'Kitta' of adeps. The 'Kitta' of bones is hair (of the head and the body) ; that of marrow is the oily-substance in the body ; that of the skin is the secretions flowing from the eyes. From digestion (of the food eaten) thus arise, it is said, both 'Prasada' and 'Kitta' of the 'Dhatus.'

tr. Avinash Chandra Kaviratna (1896-1913)

The mula-text source for the secondary tissues (upadhatu) and the waste product (mala) belonging to each stage: milk and menstrual blood from rasa, vessels from rakta, fat and skin from mamsa, tendons and muscles from medas; and phlegm from rasa, bile from rakta, body filths from mamsa, sweat from medas, hair from asthi. This was the record's largest acknowledged gap and it is mula text, not commentary.

source

Charaka Samhita, Kaviratna's translator's footnoteChikitsasthana 15:footnote to Kaviratna's 15 (standard 15.16); no verse number of its own · checked against the source

This sudden mention of seven fires after having numbered them as [f]ive, requires explanation. The fact [is], as there are seven 'dhatus', and as those seven derive nourishment from the food eaten, there must be seven fires to cook the food into seven substances, food itself containing seven elements corresponding with or capable of nourishing the seven 'dhatus'. - T.

tr. Avinash Chandra Kaviratna (1896-1913)

That the move from five fires to seven inside the same passage is a difficulty the text does not itself resolve, and that Kaviratna had to supply a reason for it. This is the only retrieved contemporary statement of the problem at this locus.

source

Charaka SamhitaChikitsasthana 15:35 as printed by Kaviratna; standard (Trikamji) 15.36 · checked against the source

The 'dhatu' called 'Rasa' (that is, the juicy matter into which food is first converted) is continuously diffused through every part of the body simultaneously, by the life-breath called 'Vyana' whose function it is to diffuse.

tr. Avinash Chandra Kaviratna (1896-1913)

The simultaneous-distribution statement in the mula text, which is the textual basis for the later eka-kala dhatu poshana model and which sits in tension with a strictly serial reading.

source

Charaka SamhitaChikitsasthana 15:38 as printed by Kaviratna; standard (Trikamji) 15.39 · checked against the source

That heat which cooks (digests) the food eaten is the prince of all heats whose function is cooking. Indeed, all the other heats have the food-cooking heat for their root. Their increase or decrease depends on its increase or decrease.

tr. Avinash Chandra Kaviratna (1896-1913)

The subordination of the seven dhatvagnis and five bhutagnis to jatharagni, which is the doctrinal link between digestion and all downstream tissue formation. Taken with the two aphorisms above it, this is the mula-text basis for the structure later counted as thirteen fires: one that cooks the food, five elemental, seven tissue-level.

source

Sushruta SamhitaSutrasthana 14 (Shonita-Varnaniya):none. Bhishagratna prints no Sanskrit verse numbers in this chapter; it is continuous prose, at his p. 109 · checked against the source

The Rasa is successively transformed into each of the six remaining fundamental principles of the body, and continues in the shape of each for the period of three thousand and fifteen kalas [five days according to our modern computation]. Thus the Rasa is converted into semen, or into the menstrual blood (ovum) in women, in the course of a month.

tr. Kunja Lal Bhishagratna (1907-1916)

Sushruta's timing figures as the text gives them: 3,015 kalas for each stage, and the whole chain completed in a month.

source

Sushruta SamhitaSutrasthana 14 (Shonita-Varnaniya):none; Bhishagratna's marginal heading reads 'Authoritative verse on its computation', at his p. 110 · checked against the source

In the present work, as well as in other works of recognised authority, a month is calculated to consist of eighteen thousand and ninety Kalas.

tr. Kunja Lal Bhishagratna (1907-1916)

The text's own definition of the month in kalas, which is what makes the 3,015-kala figure add up to a month over six stages and what Bhishagratna's five-day conversion rests on. It also shows that the kala here is defined only as a fraction of a month, not in any independent unit.

source

Sushruta SamhitaSutrasthana 14 (Shonita-Varnaniya):none; prose, at his p. 108 · checked against the source

The Rasa or the lymph chyle, thus flowing out of the heart, constantly soothes, maintains, and irrigates by transudation the body, and further contributes to its growth, and supports life owing to the dynamical effects of causes which lie beyond the ken of human understanding.

tr. Kunja Lal Bhishagratna (1907-1916)

The irrigation image in the mula text on which the later kedari-kulya analogy is built, and the text's own admission that the operating cause is not understood.

source

Sushruta SamhitaSutrasthana 14 (Shonita-Varnaniya):none; under Bhishagratna's heading 'Metrical texts', at his p. 108 · checked against the source

The chyle produces blood. From blood is formed flesh. From flesh originates fat which gives rise to bones. From bones originate marrow, which, in its turn, germinates semen.

tr. Kunja Lal Bhishagratna (1907-1916)

Sushruta's statement of the same seven-tissue order as Charaka, independently.

source

Sushruta Samhita, Bhishagratna's explanatory footnoteSutrasthana 14 (Shonita-Varnaniya):Sushruta Samhita, Sutrasthana 14 (Shonita-Varnaniya); Bhishagratna's asterisked footnote at the foot of vol. 1 pp. 109-110 (NOT 109-111). Numbering: Bhishagratna's own printed page numbers in volume 1 of his translation, read off the running heads of the archive.org scan (englishtranslati01susruoft, pagination identical to the cited b24758619_0001). No verse number is involved; the page range is the whole address. · checked against the source

Subsequently it enters into the bodily principle of Rasa, becomes matured by the native heat of the latter, and is resolved into three factors, or in other words, its excreted matter is transformed into phlegm, its thick or condensed portion is transformed into and assimilated in the matured Rasa of the body, whereas its subtile essence is metamorphosed into blood. [... the same three-factor resolution is then run through blood, flesh, fat, bone and marrow ...] The semen again, in its nascent stage, enters into the organic principle of that name and there matured under its native heat is resolved into two factors, viz. thick and thin. The thick portion is assimilated into the organic principle of semen, the thin one being metamorphosed into (albumen). 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.

tr. Kunja Lal Bhishagratna (1907-1916)

The only statement this record has actually retrieved of the three-fold resolution of each stage into an excreted, a condensed and a subtile fraction, which is the analysis the secondary literature attributes to Dalhana, together with the eighth-principle view of ojas.

source

Sushruta SamhitaSharirasthana 3 (Garbhavakranti):Bhishagratna's section 17 (his own section number; he prints no Sanskrit verse numbers) · corrected against the source

The umbilical chord (Nadi) of the foetus is found to be attached to the cavity of the vein or artery of its maternal part through which the essence of lymph-chyle (Rasa) produced from the assimilated food of the mother, enters into its organism and fastens its growth and development, (a fact which may be understood from the analogy of percolation or transudation of blood). Immediately after the completion of the process of fecundation, the vessels (Dhamani) of its maternal body which carry the lymph-chyle (Rasa) and run laterally and longitudinally in all directions through it, tend to foster the foetus with their own transudation all through its continuance in the womb.

tr. Kunja Lal Bhishagratna (1907-1916)

The prenatal nutrition model (percolation and transudation, later glossed as upasneha and upasweda), which modern reviews cite as the Ayurvedic counterpart of histotrophic then haemotrophic nutrition.

source

Sushruta Samhita, Bhishagratna's Introduction (his own dissertation, not the Samhita)Introduction to Vol. I section headed 'Agni and Dhatvagnis', his pp. xlviii-xlix:none; the Introduction is unnumbered prose · checked against the source

Sushruta raises the question whether there is any kind of fire in the human organism other than the Pittam ; or are they identical ? Sushruta holds that the Pittam is the only fire present in the system, in as much as all acts from the digestion of food to the disintegration of tissues are performed with the help of the Pittam, which includes within its signification what is connoted by Anabolism and Katabolism of Western Physiologists. But Agnivesha and certain sections of the Ayurvedic Acharyayas hold that there are five Anjali-fuls of Agni in the human organism. This discrepancy is best explained away by including one Yava measure of Agni (enzymes, ferment) in the five Anjali-measures of Pittam. The A[y]urvedic Physiology recognises the exist[e]nce of another kind of Agni, which is called Dhatvagni (protoplasm) and which it cl[a]ssifies into seven different kinds, Arunadatta, the celebrated commentator of the Ashtangahridayam, holds that there are as many Dhatvagnis as the constituents of the body.

tr. Kunja Lal Bhishagratna (1907), Vol. I Sutrasthanam

That the dhatvagni doctrine the whole record treats as its causal engine is disputed at its foundation, in a public-domain source: whether any fire exists in the body other than pitta, whether the measure of agni in the body is five anjalis, and how many dhatvagnis there are, with Sushruta, Agnivesha and Arunadatta ranged against each other. This is the material behind the new contested entry on dhatvagni.

source

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.

Explication on tissue nutrition in prenatal and postnatal life: An Ayurveda perspective. · J Ayurveda Integr Med · 2021 · PMID 32855015

Sets out all three nyayas plus eka-kala dhatu poshana as a single framework and maps them onto prenatal histotrophic and haemotrophic nutrition and postnatal enteral nutrition. A PubMed search for 'khale kapota' run on 2026-10-06 returns exactly one record, this one, so within that bounded search it is the only indexed paper that treats the khale-kapota model at all; that is a statement about one search string on one date, not about the literature as a whole.

How much it shows. Narrative review with no data, no systematic search and no stated methodology. It presents the correspondences (upasneha and upasweda as histotrophic nutrition, garbhanabhinadi as the umbilical cord) as interpretive readings, and the mapping is asserted rather than tested. Useful as a map of the doctrine; it is not evidence that the doctrine is true.

Physiological aspects of Agni. · Ayu · 2010 · PMID 22131747

A conceptual account of agni as the transformative agent, including the thirteen-fold scheme of one jatharagni, five bhutagni and seven dhatvagni that underlies dhatu formation, and the internal debate over whether agni is identical with pitta.

How much it shows. Conceptual and textual paper in Ayu, not an empirical study. No measurements, no subjects. Its value here is that it documents that the agni and pitta identity is itself disputed inside the tradition, which matters because dhatvagni is the causal engine the dhatu-formation model depends on.

Clinical efficacy of panchakola on raktakshaya. · Ayu · 2013 · PMID 24250128

The one primary clinical study surfaced by this record's searches in which dhatvagni is the stated causal premise. Its abstract reasons: 'Because of Jatharagnimandya, Rakta Dhatvagni gets disturbed and leads to Raktakshaya.' 46 patients with raktakshaya were randomised to a Panchakola tablet or a rice-powder placebo for six weeks, with haematological endpoints.

How much it shows. Randomised and placebo-controlled, which is more than any other reference here, but it does not test the doctrine. The endpoints are haemoglobin, serum iron, total iron-binding capacity, ferritin and blood indices; dhatvagni impairment appears only in the rationale and is never measured. A drug effect on anaemia is compatible with any mechanism, so this trial is evidence about Panchakola and not evidence for or against dhatvagni as the engine of tissue formation. Single centre, n=46, reported in Ayu.

Concepts of Dhatu Siddhanta (theory of tissues formation and differentiation) and Rasayana; probable predecessor of stem cell therapy. · Ayu · 2014 · PMID 26664231

A named instance of the pattern this record's evidenceState describes, offered so that the warning is not a general statement with no example behind it: a review proposing dhatu siddhanta, the theory of tissue formation and differentiation, as a 'probable predecessor of stem cell therapy'.

How much it shows. Narrative review with no data and no stated search. The authors' own framing is prospective rather than evidential: 'This review may be helpful to open the door of future research area in the field of reverse scientific approach of Ayurveda in the context of Dhatu Siddhanta ... and theory of stem cell.' The stem-cell correspondence is proposed, not tested. Cited only as an example of asserted correspondence, and it supports no claim about dhatu formation.

Can cholesterol and its products serve as biomarkers for ojas? · J Ayurveda Integr Med · 2025 · PMID 41289791

Relevant to dhatu formation only indirectly: it links specific dhatus to cholesterol-derived steroid hormones, continuing a 1995 proposal. It is the nearest thing in the retrieved literature to a proposed biochemical substrate for the dhatu chain.

How much it shows. Hypothesis paper. The authors describe their own output as 'candidate biomarkers' and 'indirect' proof. No experiment, no cohort, no assay was performed. It should not be read as establishing any dhatu-to-molecule correspondence.

Open questions on this record

Recorded rather than resolved: what this entry cannot currently settle.

  • Citation #8 (now the Sushruta Sharirasthana 3 entry): the 2026-09-20 refutation and its correction to section 16 are WITHDRAWN on re-retrieval of 2026-10-06. Bhishagratna prints his section number after the section, so the passage is his section 17, which the record originally had right. Evidence in that entry's locationCorrectionNote and correctionHistory.
  • Citations #3 and #4 as the record previously numbered them (Kaviratna's 35 and 38) carried his printed numbers unlabelled and are now corrected to standard 15.36 and 15.39, pending confirmation against a printed Trikamji edition.

How to cite this entry

Age Ayurveda Nighantu, Dhatu Formation and the Three Models of Tissue Nutrition, https://nighantu.ageayurveda.com/concept/dhatu-formation/, CC BY 4.0. The whole set is downloadable from the concept index. Machine-readable source: Markdown. 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.