Is Your Shilajit Safe? Heavy Metals & How to Read a COA (2026)
Informational summary of published research — not medical advice. This page is about product safety and purity, not treatment claims.
Shilajit is scraped from mountain rock, so contamination is the real risk — not the benefits hype. A 2024 analytical review found shilajit can contain about 65 different metals, some samples over safety limits (PMID 38393486). A 2025 study measured thallium — more toxic than mercury — at up to 0.5 µg/g in commercial supplements, sometimes higher than in the raw resin (PMID 39827344). Translation: "purified" is not a safety guarantee, and neither is "raw and natural." The only real signal is a batch certificate of analysis (COA) with a full heavy-metal panel. Below: how to read one, and why the fulvic-acid % on the label is more confusing than it looks.
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The contamination problem is real, recent, and under-reported
Most shilajit content online is either benefits hype or brand reassurance. The genuinely useful, evidence-based story is the one almost nobody tells: what's actually in the resin besides the marketed actives.
- ~65 possible metals, some over the limit. A 2024 review in Biological Trace Element Research catalogued the heavy-metal content of shilajit and concluded bluntly that "consumption without knowing permissible levels of metals is not safe." Shilajit's humic substances can actually bind some metals, which is part of its traditional appeal — but that doesn't neutralize the toxic ones present in a given batch (Hussain & Saeed 2024, PMID 38393486).
- Thallium is the sleeper risk. A 2025 study in BMC Chemistry quantified thallium — a metal more toxic than mercury — in raw shilajit and in five commercial supplements. It found up to 0.226 µg/g in raw material and up to 0.5 µg/g in finished supplements. That some products tested higher than raw resin is the important part: processing and formulation can concentrate a contaminant rather than remove it (Kamgar 2025, PMID 39827344). Almost no consumer COA even tests for thallium.
- Raw ≠ safe. "Wild, raw, authentic" reads like a purity signal but is the opposite: unpurified shilajit can carry mycotoxins, microbes and grit, which is why Ayurvedic tradition purifies it (shodhana) before use. The point of processing is safety — but as the thallium data shows, processing alone isn't proof of it.
| Item | Value |
|---|---|
| Raw shilajit (max) | 0.226 µg/g |
| Commercial supplements (max) | 0.5 µg/g |
The fulvic-acid % on the label is not what you think
Fulvic acid is shilajit's headline active, so brands compete on the percentage — and the numbers are all over the map, from 15% to 95%. Most sites either repeat the biggest number credulously or declare all high numbers fake. The honest answer is in the middle, and it comes down to how the fulvic acid was measured:
| Claimed % | How it's measured | Is it honest? |
|---|---|---|
| 15–20% | Classic wet-chemistry on purified resin | Yes — the realistic range for whole resin |
| ~50% | HPTLC standardized to fulvic acid plus dibenzo-α-pyrones (e.g. PrimaVie) | Yes — a different, published method, not fraud |
| 80–95% | Often unstated method, or peat-derived fulvic acid (not glacial shilajit) | Be skeptical — no method disclosed is the tell |
So a jar reading "15% fulvic acid" and a capsule reading "50%+" can both be honest — they're not measuring the same thing. What should make you skeptical isn't a high number; it's a high number with no test method named, or "fulvic acid" powder that turns out to be extracted from peat rather than genuine mountain shilajit (Kamgar 2025 composition review, PMID 38133965).
How to read a shilajit certificate of analysis (COA)
A COA is a lab report for a specific production batch. It's the single best purchase signal for shilajit — but only if it actually tests the right things. Here's the checklist:
- A batch-specific COA from an accredited third-party lab (not the brand's own kitchen)
- A heavy-metal panel naming lead, arsenic, mercury AND thallium
- A fulvic-acid % with the test method (wet-chem vs HPTLC)
- A disclosed purification method
- "Lab tested" as a badge with no viewable report
- A heavy-metal panel that omits thallium (most do)
- "100% pure" or "heavy-metal free" — no mountain-rock extract can honestly claim zero
- An 80%+ fulvic-acid claim with no method stated
Resin vs capsule vs powder vs gummies: ranked by how verifiable they are
The form you buy changes how easy it is to know what you're getting — and it's the real answer to the common "shilajit resin vs capsule" question. From most to least verifiable:
| Form | Dose precision | Purity verifiability | Verdict |
|---|---|---|---|
| Standardized extract capsule (e.g. PrimaVie) | Exact mg per capsule | Published method + batch COA | Best for a verifiable dose |
| Purified resin | Scooped by eye (~pea size) | Depends entirely on the brand's COA | Traditional form; only as good as its paperwork |
| Powder | Measurable, but more processing | More steps = more room for filler (maltodextrin, cheap humic extract) | Check it's real shilajit, not peat fulvic |
| Gummies | Often <100 mg, hidden in a blend | Least testable, most diluted | Treat as low-dose novelty, not a serious dose |
This is why our best-shilajit ranking leads with the standardized, purity-tested extract rather than the cheapest resin: with shilajit, a verifiable dose is worth more than a low sticker price. For how much to actually take, see the dosage guide.
Who should be extra cautious
Because shilajit concentrates minerals, a few groups should be careful even with a tested product:
- Hemochromatosis or iron overload: shilajit contains iron and fulvic acid may enhance mineral absorption — a theoretical precaution, not documented harm, but worth avoiding.
- Pregnancy or breastfeeding: avoid — there's no human safety data.
- On medication: no shilajit drug-interaction studies exist, so clear it with a clinician first.
The evidence bar is worth keeping in mind too: a skeptical academic review concluded shilajit's bioactivity "lacks substantial evidence" from well-designed human trials, and much of what's marketed rests on preclinical work (Wilson 2011, PMID 21530631). See the dosage guide for full dosing and safety.
Frequently asked questions
Does shilajit contain heavy metals?
It can. Shilajit oozes from mountain rock, so it naturally picks up metals — a 2024 review found shilajit can contain ~65 different metals, including lead, arsenic, cadmium and mercury, with some tested samples exceeding WHO/FDA limits. A 2025 study measured thallium (more toxic than mercury) at up to 0.5 µg/g in some commercial supplements — in some cases higher than in the raw resin. The lesson is not "avoid shilajit," it's "only buy one with a batch certificate of analysis showing a full heavy-metal panel."
Is raw or "wild" shilajit safer than processed?
No — the opposite, if anything. Raw, unpurified shilajit can carry mycotoxins, microbes, sand and heavy metals, which is why traditional practice purifies it (shodhana) before use. "Raw and authentic" is marketing, not a safety feature. But purified isn't automatically clean either: the 2025 thallium data showed some finished products testing higher than raw material. The only real signal is a third-party heavy-metal test on the actual batch.
What does the fulvic acid percentage on shilajit mean?
It depends entirely on how it was measured, which is why the numbers look contradictory. Classic wet-chemistry on purified resin usually finds 15–20%. Standardized branded extracts like PrimaVie report 50%+ because they measure fulvic acid plus a related bioactive class (dibenzo-alpha-pyrones) by a different method (HPTLC). So a 15% resin and a 50% standardized extract can both be honest. Be skeptical of 80–95% claims with no stated test method.
How can I tell if shilajit is real and safe?
Ask for the paperwork, not the vibe. A trustworthy product shows: a batch-specific certificate of analysis from an accredited third-party lab; a heavy-metal panel naming lead, arsenic, mercury AND thallium (most skip thallium); a fulvic-acid % with the test method; and a disclosed purification method. Texture cues (sticky, dissolves in warm water, no grit) are a weak secondary check, not proof. The one shilajit with published clinical testing and standardized, purity-tested material is PrimaVie.
Sources
- Hussain A, Saeed A. Heavy metals and humic substances in shilajit. Biol Trace Elem Res. 2024. PMID 38393486
- Kamgar E, et al. Quantifying thallium in shilajit and its supplements. BMC Chem. 2025. PMID 39827344
- Kamgar E, et al. A comprehensive review on shilajit's chemical composition. Crit Rev Anal Chem. 2025. PMID 38133965
- Stohs SJ. Safety and efficacy of shilajit (mumie, moomiyo). Phytother Res. 2014. PMID 23733436
- Wilson E, et al. Review on shilajit used in traditional Indian medicine. J Ethnopharmacol. 2011. PMID 21530631