Shankha Bhasma: Benefits, Evidence & Safety

TL;DR

Shankha Bhasma is calcined conch shell, essentially calcium carbonate, used in Ayurveda's Rasa Shastra tradition for acidity and digestive complaints. In rats, it showed significant anti-ulcer effects in two experimental models at 25–50 mg/kg. Standardized batches test within heavy-metal limits. No human trials exist, so efficacy in people is unproven and unsupervised use is not advised.

(54 words. Sources: Sur et al. 2013, rat anti-ulcer study; Marine Drugs 2018 standardization; NCCIH.)

What it is

Shankha Bhasma is prepared from Shankha, conch shell, a marine shell composed largely of calcium carbonate, through the classical Rasa Shastra sequence of shodhana (purification, e.g. soaking in lemon juice) and marana (calcination) via repeated puta heating cycles (Marine Drugs standardization study). Physicochemical analysis of three commercial-scale batches found 39–41% elemental calcium by ICP-OES, X-ray diffraction confirming 100% calcite (calcium carbonate) phase, and particle sizes in the sub-micron to nanometer range (same study).

In Ayurvedic classification, Shankha Bhasma belongs to the Sudha varga: the calcium group of drugs. A review of this group notes that these preparations are rich in calcium salts whose alkaline nature aids acid neutralization, which is the traditional rationale for their use in hyperacidity and dyspepsia (Ayushdhara review of Sudha varga).

Traditional use

Classical formulations containing Shankha Bhasma, such as Pravala Panchamrita Rasa, are used in traditional practice for Amlapitta (acid dyspepsia), chronic gastritis, hyperacidity syndromes, and burning sensations, with described actions including antacid, ulcer-healing, and Pitta-pacifying effects (JETIR review of Pravala Panchamrita Rasa). The Sudha varga literature describes these calcium preparations as alkaline (kshariya) agents that reduce acidity and support tissue healing (Ayushdhara review). These are traditional claims, not clinical proof: the modern evidence is assessed separately below.

What modern research says

Anti-ulcer activity in rats

In a 2013 study, purified Shankha Bhasma at 25 and 50 mg/kg was tested in Wistar rats in two gastric-ulcer models, ethanol-induced and pylorus-ligation-induced, and showed significant (P<0.001) anti-ulcer effects versus control, alongside the standard drugs omeprazole (20 mg/kg) and ranitidine (50 mg/kg) (animal study, single trial) (Sur et al., Exploratory Animal and Medical Research, 2013). Acute oral toxicity was assessed in Swiss mice in the same study. These are rat findings and do not establish anti-ulcer efficacy in humans.

Standardization and acid-neutralizing capacity

A pharmaceutical standardization study prepared three 8-kg batches by the traditional method and characterized them fully: average calcium 39.81% w/w, magnesium ~0.035%, XRD showing pure calcite, and heavy metals (Hg, As, Cd, Pb) within permissible limits (Marine Drugs, 2018). The same paper's literature review notes an acid-neutralization capacity of 9.5 mEq for traditionally prepared Shankha Bhasma (7.05 mEq for muffle-furnace preparation), and cites prior work reporting dose-dependent gastric-ulcer protection in rats without altering serum calcium, plus antispasmodic and in-vitro anti-inflammatory activity (same review).

What the evidence does not support (yet)

No human randomized controlled trials of Shankha Bhasma were found. Its antacid and anti-ulcer effects have been demonstrated only in rats and in laboratory analyses, so none of the traditional digestive indications have been proven in people.

Safety & contraindications

Shankha Bhasma is a herbo-mineral preparation, and "natural calcium" does not mean risk-free. The available animal data are limited to a single anti-ulcer study that included an acute oral toxicity assessment in mice. There are no human safety trials (Sur et al., 2013).

Because it is essentially concentrated calcium carbonate, excessive or unsupervised use carries the same category of risks as other calcium-based antacids: which is precisely why dose and duration should be set by a qualified practitioner rather than by self-experimentation. More broadly, contamination surveys of Ayurvedic products are a real concern for this category: 73.8% of 43 sampled formulations contained mercury, arsenic, or lead above FAO/WHO limits (Ayush limits: lead 10, arsenic 3, cadmium 0.3, mercury 1 µg/g) (PMC survey), and NCCIH warns that some Ayurvedic preparations may contain lead, mercury, or arsenic in toxic amounts (NCCIH: Ayurvedic Medicine: In Depth). India's Department of Ayush mandates heavy-metal testing for exported Ayurvedic medicines (PIB release).

Do not use Shankha Bhasma for heartburn or ulcers without a qualified practitioner: persistent acidity or ulcer symptoms need proper medical diagnosis, since they can signal conditions (including H. pylori infection or malignancy) that calcium ash cannot address. Avoid use in pregnancy, breastfeeding, and childhood unless a qualified practitioner specifically advises it, and buy only from GMP-certified manufacturers. Non-standard preparations may contain untransformed material or contaminants.

FAQs

What is Shankha Bhasma made from?

Shankha Bhasma is made from conch shell (Shankha), a marine shell rich in calcium carbonate. It is purified and then repeatedly calcined through puta heating cycles. Laboratory analysis of standardized batches shows it is essentially pure calcite (calcium carbonate) with about 39–41% elemental calcium and sub-micron particle sizes (Marine Drugs, 2018). It belongs to Ayurveda's Sudha varga (calcium group) of drugs.

Does Shankha Bhasma help with ulcers or acidity?

Traditionally it is used as an antacid and ulcer remedy, and a 2013 rat study found significant anti-ulcer effects at 25–50 mg/kg in two experimental ulcer models, comparable in design to omeprazole and ranitidine controls (Sur et al., 2013). Laboratory testing also confirms real acid-neutralizing capacity (Marine Drugs, 2018). But no human trial has tested it, so efficacy in people is unproven.

Is Shankha Bhasma a good calcium supplement?

It is calcium-rich (about 40% elemental calcium by weight), but it has not been studied as a calcium supplement in humans: no trials measure its absorption, bone effects, or long-term safety for this purpose (Marine Drugs, 2018). Do not substitute it for an established calcium supplement or osteoporosis treatment without a clinician's guidance.

Is Shankha Bhasma safe?

Human safety data do not exist; the only toxicity assessment is an acute oral toxicity test in mice within a single rat study (Sur et al., 2013). Standardized batches have tested within heavy-metal limits, but market surveys show contamination is common across Ayurvedic products generally (PMC). Safety data is limited: talk to a clinician, and use only practitioner-supervised, quality-tested product.

Can I take Shankha Bhasma for heartburn on my own?

We advise against it. Persistent heartburn or ulcer-like pain needs medical evaluation: causes like H. pylori infection, medication-induced ulcers, or more serious disease cannot be diagnosed or treated with a calcium preparation (NCCIH). If a qualified practitioner recommends it, it should be quality-tested product used for a defined period, not open-ended self-medication.

Why is there no dosage section in this article?

Our editorial rule is to state doses only with a pharmacopoeial monograph or clinical-trial citation. No human trial of Shankha Bhasma establishes a dose, so we omit one rather than repeat unverified figures. A qualified practitioner individualizes dose and duration.

Sources

Disclaimer

This article is for educational purposes only and is not medical advice. Bhasmas are herbo-mineral preparations with real risks if improperly prepared or used without supervision. Do not self-administer Shankha Bhasma, and do not use it to self-treat ulcer or persistent acidity symptoms. Talk to a qualified healthcare practitioner before use — especially if you are pregnant, breastfeeding, managing a medical condition, or taking prescription medicines.