LAISHA · DRAVYAGUNA

Bhallataka

भल्लातक

Semecarpus anacardium L.f.

Anacardiaceae · Semecarpus

Benefits & side effects

TRADITIONAL VIEW, WITH SAFETY LIMITS

Hindi name: Bhilawa

What the texts say Bhallataka does

What the evidence says. Traditional use is extensive and long recorded. Modern clinical evidence is limited.

Side effects and limits

Avoid or ask first: Self-treatment, absolutely.; Pregnancy and breastfeeding.; Children.; and more below.

A traditional classification, not a recommendation. The full safety record is below.

Stands in 4 groups

A Samhita can only be read forwards, from the group to its members. This is the same list read backwards.

Photographs

Matra and anupana

AS THE CLASSICAL TEXTS AND THE API PRESCRIBE

Shodhita phala0.5–1 g
AnupanaDugdha · Ghrita
KalaAdhobhakta

Among the upavisha. Used only after shodhana, only in a classical yoga, and ghrita is given alongside to blunt the vesicant action.

Reported from Sharangadhara Samhita and the Ayurvedic Pharmacopoeia of India. Laisha states what the texts prescribe; it does not recommend. No quantity here is adjusted for a particular person — not for agni, koshtha, bala, age, pregnancy, kidney or liver function, or anything already being taken.

Rasapanchaka

Rasa
KatuTiktaKashaya
Guna
LaghuSnigdhaTikshna
ViryaUshna
VipakaMadhura
PrabhavaThe texts treat bhallataka as a rasayana despite classing it among the poisons, and the combination of tikshna guna with madhura vipaka is how they explain it.
DoshakarmaKaphavatahara. It increases pitta strongly.

Katu, tikta and kashaya with ushna virya and madhura vipaka. The madhura vipaka is the detail the texts rely on for its rasayana use.

Karma and part used

RasayanaDeepanaKushthaghnaKrimighnaBhedanaMedohara

These are the actions the classical texts record. They are statements about what the tradition holds, and this library does not restate them as findings about a human body.

Upayukta angaPhala (the nut), and only after shodhana
Why it mattersThe nut is the article and it is never used raw. The oil between the shell layers is a blistering agent, and shodhana — classically rubbing with brick powder and boiling in milk — exists to remove it. Without that step this is not a medicine.

Paryaya

AgnimukhaAruskaraVirataruBhallataShophakrit

Agnimukha means fire-mouthed and Shophakrit means swelling-causing. The paryaya describe what the raw nut does to skin, and they are a warning label written in Sanskrit.

Names, by language

EnglishMarking nut
SinhalaBadulu
NepaliBhalayo
HindiBhilawa
KannadaGeru beeja
TamilShenkottai
TeluguNallajeedi
MalayalamCheru
MarathiBibba
GujaratiBhilamo
BengaliBhela
PunjabiBhilawa
OdiaBhalia
UrduBaladur

Classical references

Charaka Samhita
Chikitsasthana, chapter 1 (Rasayana)
Describes bhallataka rasayana preparations and the regimen required with them.
Bhavaprakasha Nighantu
Haritakyadi Varga
Gives the rasa, guna, virya and vipaka of bhallataka and notes its poisonous nature.
Sushruta Samhita
Sutrasthana, chapter 38 (Dravyasangrahaniya)
Included among the dravya grouped by action.

Rasa, guna, virya, vipaka and karma are recorded as the classical texts give them, with the text and section named so a student can open the book and check. Where an exact chapter and verse could not be confirmed, this library names the section rather than inventing a number.

Formulations it appears in

Bhallataka RasayanaNamed for the dravya.
AmritabhallatakaNamed for the dravya.
Sanjivani VatiPurified bhallataka is among the dravya.

Adulterants and substitutes

Semecarpus travancoricus and related species are collected with it. The substitution that matters most is not of species but of process: nuts sold as purified that have not been through shodhana look identical and are a blistering agent. Anacardium occidentale, the cashew, is in the same family and its shell oil carries the same class of compound, which is why cashew shells are also not handled bare.

Identity

Matched live against the GBIF backbone on 28 September 2026 at 99 per cent confidence. The same family as mango and cashew, and it shares their characteristic irritant oil in a far more aggressive form. Classed among the upavisha, the lesser poisons.

A WAY TO REMEMBER IT

Semecarpus is semeion (a mark) + karpos (fruit) — the juice marks cloth indelibly, which is why it was the laundry-marking nut. Anacardium, heart-shaped-without: the nut sits outside the fleshy part.

What the tradition holds

Bhallataka is described in the Charaka Samhita among the rasayana with its own regimen, and in the Bhavaprakasha Nighantu as a poison. That is what the tradition holds and where it is written down, not a finding about what the nut does in a body.

Constituents. The nut oil carries urushiol-type phenols, chiefly bhilawanol, the same chemical class as the irritant in poison ivy and in cashew shell.

What the evidence says

StatusTraditional use is extensive and long recorded. Modern clinical evidence is limited.
SuggestedNo claim of established clinical effect is made here. The modern literature on this plant is largely about contact dermatitis and poisoning.
Not establishedThere is not enough good clinical evidence to establish an effect on any named health condition. Long traditional use is not a substitute for that evidence, and this library does not present it as one.
The honest gapHow much irritant remains after shodhana depends entirely on how the shodhana was done, and that is not visible in the finished article.

Safety

The raw nut is a blistering agent and this is not a mild statement. Contact with the oil causes severe skin inflammation with blistering that can last weeks, and it is a well-documented cause of dermatitis in India, including from the juice being used as a laundry marking ink — which is where the English name comes from. Taken internally unpurified it causes ulceration of the mouth and gut, and poisoning is recorded. Even properly purified, it is ushna and tikshna enough that the classical texts prescribe a strict regimen alongside it, avoiding heat, sun and pungent food. This is a dravya for a qualified practitioner to direct and not one for self-treatment. Anyone on medication, pregnant, or managing a diagnosed condition should speak to a doctor or a qualified practitioner first.

Side effectsBurning sensation in the mouth and stomach
Severe skin blistering on contact with the raw oil
Mouth ulceration
Acidity
ContraindicationsSelf-treatment, absolutely.
Pregnancy and breastfeeding.
Children.
Pitta conditions, acid dyspepsia and peptic ulcer.
Any use of raw or unpurified material.
InteractionsThe nut oil is a vesicant and causes severe contact dermatitis; purification is not optional.
Anticoagulants — bleeding has been reported with unpurified material.
Pregnancy and breastfeedingNot to be used in pregnancy or breastfeeding in any quantity or form.
The raw nut oil blisters skinThe oil carries urushiol-type phenols, the same chemical class as poison ivy. Contact causes severe blistering dermatitis lasting weeks, and it is a recognised occupational and domestic injury in India. Handling raw nuts without protection is how most of these cases happen.
Unpurified nut taken internally ulcerates the gutBhallataka that has not been through shodhana causes ulceration of the mouth and gastrointestinal tract, and poisoning from it is recorded. The purification is not a refinement.

Growing it

ClimateTropical, in dry and moist deciduous forest.
SoilWell-drained ground; tolerant of poor soil.
PlantingA tree, raised from seed.
HarvestFruits are collected when ripe and handled with protection, because the oil blisters skin. They are then purified before any use.
What is not statedThis library has not verified region-specific spacing, variety and yield figures against a named agricultural authority for every growing country, and does not state them rather than guessing.

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What this is not

Sources

GBIF Backbone Taxonomy species-match record for Semecarpus anacardium L.f.
Global Biodiversity Information Facility (GBIF) · read 2026-09-28
Confirming live, rather than from memory, the accepted botanical name and family behind the Sanskrit name.
https://api.gbif.org/v1/species/match?name=Semecarpus%20anacardium
The Ayurvedic Pharmacopoeia of India — Bhallataka (Semecarpus anacardium L.f.)
Pharmacopoeia Commission for Indian Medicine and Homoeopathy, Ministry of Ayush, Government of India · read 2026-09-28
The official Indian pharmacopoeial standing of the dravya and the identity of the part used as the pharmacopoeial article.
https://pcimh.gov.in/
Compendium of Monographs — Natural Health Products
Health Canada, Natural and Non-prescription Health Products Directorate · read 2026-09-28
A regulator outside India that publishes monographs covering Ayurvedic ingredients — used for the safety framing, and for the line between a permitted traditional-use claim and clinical evidence.
https://www.canada.ca/en/health-canada/services/drugs-health-products/natural-non-prescription/applications-submissions/product-licensing/compendium-monographs.html
Classical matra by dose form
Sharangadhara Samhita, Madhyama Khanda
The classical quantity for each dose form, as the standard reference gives it. Sharangadhara is where Ayurveda's dose forms and their measures are set out, and it is what every Dravyaguna textbook reproduces.
https://niimh.nic.in/ebooks/esharangadhara/
← all dravya