Ayurveda Codex›Formulations›Bhasma

Last verified: April 2026

Bhasma

भस्म — Bhasma — "Ash; calcined preparation; that which has become ash"

Bhasma is the most precisely regulated and most misunderstood category in classical Ayurveda — metals and minerals processed through mandatory purification (Shodhana) then repeated incineration cycles (Marana) to produce nano-scale ash. Classical texts document Bhasma as reaching tissue depths inaccessible to plant preparations. Modern research confirms the nano-particle nature of properly prepared Bhasma — and documents the toxicity of improperly prepared versions.

Important noticeThis page documents what classical texts record about Bhasma preparations. This is not medical advice. Which formulation is appropriate requires assessment by a qualified practitioner (BAMS or MD Ayurveda). Full disclaimer →
Definition
Two mandatory stages: Shodhana (purification of raw material) followed by Marana (repeated incineration cycles — 7 to 108 depending on the specific Bhasma) to produce nano-scale, bioavailable, non-toxic ash. Classical quality tests verify completion at each stage.

Why metals — the classical rationale

Rasa Shastra texts document: plant compounds have molecular sizes limiting penetration into certain tissues. Properly processed metals are reduced to nano-scale particles that bypass these size limitations. Classical texts describe Bhasma as "Sukshma" (subtle) to a degree plant preparations cannot achieve — specific Bhasma are documented for tissues that plant herbs cannot adequately reach.

Modern research confirms the nano-particle nature. X-ray diffraction and transmission electron microscopy studies (Journal of Ethnopharmacology and Ancient Science of Life) document classical Bhasma preparations containing particles of 25–100 nanometers. Lauha Bhasma particle studies document 50–60nm with amorphous crystal structure distinct from raw iron.

Critical safety and regulatory note
Improperly prepared Bhasma retains heavy metal toxicity. Classical texts document extensive quality tests precisely because incomplete preparation is toxic. Ministry of AYUSH and Schedule T GMP require specific quality testing for all Bhasma including heavy metal screening. Purchase exclusively from Ministry of AYUSH-licensed manufacturers.
1
Shodhana (purification): Raw material purified to remove crude toxic compounds. Iron (Lauha): heated red-hot and quenched in Triphala Kashaya, cow's urine, oil repeatedly. Gold (Swarna): heated and quenched in sesame oil. Mica (Abhrak): heated and quenched in cow's milk. Changes crystal structure and removes volatile impurities.
2
Marana (incineration): Purified material mixed with specific herbal juices (Bhavana dravya), formed into cakes, placed in sealed crucible (Sharava Samputa), fired. Number of firings: Lauha Bhasma — 100 Puta; Swarna Bhasma — 108 Puta; Abhrak Bhasma (Sahasraputi) — 1000 Puta.
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Classical quality tests: Three primary tests: Apunarbhava (does not revert to metallic form on reheating); Rekhapurna (fine enough to fill fingerprint lines); Varitara (specific gravity test — particles float on water). Modern addition: heavy metal screening by ICP-MS.

Prescription — requires specialist assessment

Indicated exclusively for conditions in classical Rasa Shastra texts requiring metallic preparations — severe chronic conditions where plant preparations have been found insufficient and where the deep-tissue penetration of Bhasma is specifically required. Examples: severe anaemia (Lauha Bhasma); advanced Rasayana for deep tissue depletion (Swarna Bhasma); neurological degenerative conditions (Abhrak Bhasma).

Requires BAMS with MD Ayurveda specialisation in Rasashastra and Bhaishajya Kalpana. Not a first-line prescription and not appropriate for self-administration.

Example Bhasma preparations

Lauha BhasmaIron ash — for Pandu (anaemia) and Yakritvikar (liver conditions). Most commonly prescribed Bhasma.
Swarna BhasmaGold ash — for severe depletion and deep Rasayana. 108 Puta preparation.
Abhrak BhasmaMica ash — chronic cough, Rajayakshma, neurological conditions. Sahasraputi form most potent.
Tamra BhasmaCopper ash — liver and spleen conditions.
Praval BhasmaCoral calcium carbonate ash — for Pitta conditions, acidity, and bone conditions.