Thallium in Shilajit — What the 2025 Toxicology Study Shows

Last reviewed: April 23, 2026 · By Dr. Ekta Gupta · Evidence tier labels apply on every claim (see our editorial policy)

Summary: A 2025 paper in Food and Chemical Toxicology tested commercial shilajit brands from the Indian market and found a subset of them contained thallium — a heavy metal not included in the standard Ayurvedic four-metal purity panel — at levels above EU safe-consumption limits. This article explains what thallium is. Why it ends up in shilajit, how brands that do five-metal testing protect consumers.

What a legitimate lab report should actually show.

The finding in plain terms

Shilajit has been regulated in India for decades under the Ayurvedic Pharmacopoeia of India (API). Needs heavy-metal testing for four metals: lead, cadmium, arsenic, and mercury.

For most of the last forty years. Four-metal panel has been the accepted safety standard.

In 2025, researchers published independent testing of commercial shilajit brands sold on the Indian market and added thallium — a fifth heavy metal not on the Ayurvedic panel — to the screen. A meaningful subset of the brands tested at levels exceeding the European Union's safe-consumption thresholds for thallium in food supplements.

This is not a recall-worthy crisis. But it is a clear signal that the standard four-metal heavy-metal test is no longer enough for consumer safety in the 2020s, and that per-batch third-party testing with a five-metal panel — including thallium — should be the new baseline.

What is thallium, and why is it in shilajit?

Thallium (atomic symbol Tl, atomic number 81) is a soft. Naturally occurring heavy metal found in trace amounts in the Earth's crust.

It's considered highly toxic at low doses — more acutely toxic than lead — and it accumulates in tissue over time. The US EPA classifies thallium as a contaminant of concern in drinking water at levels above 0.002 mg/L.

Thallium shows up in shilajit the same way other heavy metals do: geological leaching. Shilajit is a natural biomineral exudate that forms over centuries in rock fissures in high-altitude mountain ranges — primarily the Himalayas. But also the Altai, Caucasus, and Tien Shan.

As the source rock has natural thallium ore. So does the raw shilajit before purification.

What matters is whether the purification process — and the final lab testing — detects and controls for it. Traditional Ayurvedic purification (called shodhana) does not especially remove thallium.

Modern solar purification combined with filtration can cut thallium levels. But only if the manufacturer actually tests for it.

Why the Ayurvedic four-metal panel misses thallium

The Ayurvedic Pharmacopoeia of India, first formalised in 1978 and regularly updated. Specifies a four-metal panel because those four metals — lead.

Cadmium, arsenic, mercury — are the most common heavy-metal contaminants in mineral-based Ayurvedic preparations historically. Thallium simply wasn't on the radar when the panel was standardised.

The 2025 Food and Chemical Toxicology paper is part of a broader trend in analytical toxicology where researchers are applying ICP-MS (Inductively Coupled Plasma Mass Spectrometry) to traditional supplements with expanded element panels. ICP-MS can simultaneously screen 30+ elements.

So adding thallium to a routine shilajit screen is no longer a technical or cost obstacle.

What it needs is a manufacturer willing to specify thallium on the test order and publish the result.

What a safe shilajit Certificate of Analysis should show

A legitimate shilajit Certificate of Analysis (COA) issued by an accredited third-party lab like Eurofins in 2026 should include, at minimum:

1. Fulvic acid content — quantified by the Indian Pharmacopoeia spectrophotometric method. This is the primary authenticity biomarker. A real COA shows a percentage (typically 40-80% for resin-form shilajit); certificates claiming "99% fulvic acid" are almost always fake.
2. Five-metal heavy-metal panel — lead (Pb), cadmium (Cd), arsenic (As), mercury (Hg), and thallium (Tl). Each metal should be reported with a numeric value (in mg/kg or ppm) and a reference to the applicable safe-consumption threshold (EU EC 1881/2006, FSSAI limits, or USP).
3. Microbial panel — total aerobic count, yeast and mould, Salmonella, E. coli, and Staphylococcus aureus. Shilajit is an organic substance and can support microbial contamination if not properly processed.
4. Dibenzo-alpha-pyrone chromoprotein (DBP) fingerprint — the secondary authenticity marker established by Ghosal (1991). Not every COA includes this, but the most rigorous ones do.
5. Batch identifier and analysis date — the COA must be tied to a specific production batch, not "brand-generic" testing from years ago.

Yeti Life's current batch COA — publicly downloadable here — lists 76.12% fulvic acid by Indian Pharmacopoeia method, full five-metal panel including thallium. Microbial screen, all tied to batch B023724DC25.

This is the template consumers should look for from any shilajit brand they trust.

How to evaluate a shilajit brand's safety testing in 2026

After the 2025 thallium finding. The decision tree for evaluating commercial shilajit brand safety is straightforward:.

1. Does the brand publish a COA publicly? If not, disqualify immediately. "Lab tested" claims without a downloadable certificate are marketing, not proof.
2. Does the COA name a specific third-party lab (Eurofins, SGS, Intertek, Bureau Veritas)? "Tested in-house" is not third-party.
3. Does the COA show a five-metal panel including thallium? If it shows only four metals, the brand has not screened for the most recently documented contaminant in the category.
4. Is the COA batch-specific? Look for a batch number and analysis date within the last 12 months.
5. Is fulvic acid quantified by the Indian Pharmacopoeia spectrophotometric method? This is the accepted analytical standard — other methods (like total acid extraction) over-estimate fulvic acid content and are frequently used to support inflated marketing claims.

What the 2025 paper does not show

For clarity on the boundaries of this research:

• The paper tested a sample subset of the Indian shilajit market. It does not claim that all brands fail the thallium screen, and named brands published in the peer-reviewed text should be checked against the paper directly.
• The paper does not report clinical illness from consuming the contaminated brands — it reports analytical detection of thallium above regulatory thresholds.
• The paper does not establish that thallium contamination is unique to Indian-market shilajit; similar heavy-metal contamination has been documented in shilajit sold in other markets, though the specific thallium finding is the most recent.

Scientific uncertainty should be admitted. But the practical takeaway for consumers is unambiguous: in 2026, buy shilajit from brands that publish five-metal panel COAs from accredited third-party labs.

Tied to specific production batches.

Further reading on shilajit safety and testing

• The Yeti Life research library — 18 peer-reviewed shilajit studies with evidence tiers, PubMed links, and editorial summaries (CC-BY 4.0 licensed)
• Current Eurofins Certificate of Analysis — batch B023724DC25, full five-metal panel, 76.12% fulvic acid
• Fulvic acid in shilajit: why percentage matters for quality
• How authentic shilajit is purified: from mountain rock to resin
• Himalayan shilajit vs Altai vs Caucasus: which source is best?

Citing this article

Journalists, health bloggers. Researchers are welcome to quote or summarise this article with attribution. Our full research library at theyetilife.com/pages/research is licensed CC-BY 4.0 so any section can be adapted with credit.

For press inquiries or source interviews on shilajit safety and authentication. Contact research@theyetilife.com — 48-hour response.

This article is informational and does not make up medical advice. Consult a qualified healthcare professional before starting any new supplement.

Especially if you have pre-existing conditions, are pregnant or nursing. Or are taking prescription medications.

Related: How Yeti Life sources and tests for safety

Key references

This article references the following peer-reviewed studies. See our full research library for the complete 18-study catalog with evidence tiers.

• Wilson E et al. (2011). J Ethnopharmacol: Shilajit chemistry and quality control.
• Stohs SJ (2014). Phytother Res: Shilajit safety review — heavy-metal context.
• Carrasco-Gallardo C et al. (2012). Int J Alzheimers Dis: Shilajit as neuroprotective agent.

Frequently asked questions

What is the 2025 thallium paper about?

A 2025 Food and Chemical Toxicology study tested commercial Indian shilajit brands and found thallium in a subset of products above EU safe-consumption limits.

What is thallium and why is it dangerous?

Thallium is a heavy metal with high toxicity even at low doses. It's not on the standard four-metal Ayurvedic Pharmacopoeia panel. So most brands don't test for it.

How can I avoid thallium in shilajit?

Choose brands that publish a full five-metal Eurofins-style COA including thallium for the specific batch you receive. Yeti Life publishes batch-specific COAs at /pages/lab-results.

Is occasional shilajit use risky?

For brands without thallium testing, even occasional use accumulates exposure over time. Stick to batch-tested products.

Related guides on Yeti Life

• Seasonal dosage guide for India
• Buyer beware: 2026 fake-shilajit report
• How authentic resin is purified
• Shilajit for men over 40
• Shilajit for students & office workers
• Shilajit vs sea moss
• Shilajit and blood sugar
• Shilajit for women: 10 studies
• Shilajit for students: focus & memory
• Shilajit tasir: hot or cold?
• Shilajit cycling: when to take breaks
• Best Ayurvedic supplements for stamina
• Shilajit pillar guide
• About Dr. Ekta Gupta
• Our sourcing
• Lab results & COA
• About Yeti Life
• Shilajit brand comparisons
• Dosage & timing
• Sourcing & safety
• The science of shilajit
• Yeti Life shilajit resin

Evidence, Sourcing & Verification

Every claim about shilajit should be traceable to three things: peer-reviewed research. Verified geographic sourcing, and per-batch lab testing.

Without all three, you are trusting a label.

• Research: Our 18-study research library catalogues every peer-reviewed paper we cite, with evidence tiers and PubMed links. The full evidence narrative lives in our complete shilajit guide.
• Sourcing: Real shilajit only forms above ~14,000 feet in specific Himalayan rock formations. We document our full supply chain on our sourcing transparency page.
• Verification: Every batch is tested by Eurofins for fulvic acid content (API pharmacopeial method) and heavy metals including thallium. The raw Certificates of Analysis are published in our lab results archive.
• Editorial standards: How we research, fact-check, tier evidence, and correct errors is documented in our editorial policy.
• Reference: Common questions are answered in our shilajit FAQ, technical terms are defined in our glossary, and recent site updates are tracked in what's new.

How to Verify These Claims Yourself

Health content on the internet is uneven. Even peer-reviewed studies vary in quality — sample size, blinding, conflict-of-interest disclosure. Replication status all matter.

Here is the framework we use. And you can apply it to anything you read about shilajit (including this article):.

1. Check the evidence tier. Tier A = randomized controlled trials (RCTs) on humans. Tier B = systematic reviews and meta-analyses. Tier C = animal or in vitro studies. Tier D = traditional use and chemistry. Most shilajit benefit claims rest on Tier C — useful as mechanistic hypothesis, not as clinical proof. We label every claim by tier in our research library.
2. Look at sample size and duration. A 14-day study on 12 people tells you very little. The Pandit 2016 testosterone RCT (60 men, 90 days) is solid; many viral wellness claims rest on much weaker designs. Always check N (number of participants) and duration before trusting a number.
3. Watch for conflict of interest. If the study was funded by a brand selling the product, expect bias even when the methodology is sound. Independent academic studies (universities, government grants) carry more weight.
4. Demand a Certificate of Analysis. Any shilajit brand can claim "76% fulvic acid" — only Certificates of Analysis from accredited labs (NABL, Eurofins, SGS) prove it. We publish our Eurofins COAs in the lab results archive with batch numbers you can cross-reference.
5. Cross-reference PubMed. Don't trust press releases. Search the study title on PubMed [Review] directly. If a brand cites a study but won't link to PubMed, that's a red flag.

When Shilajit Isn't the Right Choice

Honest health writing means saying when something doesn't apply. Shilajit is not a universal solution.

Skip it (or talk to your doctor first) if:

• You are pregnant or breastfeeding. Insufficient safety data — most studies excluded these populations. The safe answer is no.
• You have a known iron-overload condition. Shilajit naturally contains iron and aids absorption. People with hemochromatosis or thalassemia should avoid.
• You are on multiple prescription medications. Shilajit can interact with diabetes medication (additive hypoglycemia), blood thinners (theoretical interaction), and thyroid medication. Always inform your physician.
• You expect TRT-level effects. Natural supplements work modestly. The Pandit 2016 RCT showed +20% testosterone — clinically significant for borderline-low men, but not equivalent to medical hormone replacement. If you have clinical hypogonadism, see an endocrinologist.
• You have a known allergy to humic substances. Rare but documented.

The best supplement is the one you don't need. If your fatigue, low energy, or low libido has a treatable medical cause (anemia.

Thyroid disease, depression, sleep apnea. Chronic infection), addressing that is dramatically more good than any adaptogen. Shilajit can be part of a wellness protocol once medical causes are ruled out — not a substitute for diagnosis.