Adverse events and case reports

What the safety literature reports

A 2014 safety review of shilajit concluded that animal studies had not shown significant toxicity and that the human studies it examined did not report serious adverse effects.^[1] A 91-day repeated-dose study in rats likewise reported no significant toxicity at the doses tested.^[4] The human trials, of up to 48 weeks, reported shilajit as generally well tolerated.^[5][6]

Why “no reported problems” isn’t proof of safety

See what a safety study can tell you and why long-term data matter.

Case reports and the contamination signal

We found few published case reports describing harm from shilajit specifically. The better-documented concern is contamination in the wider category of Ayurvedic products. A US study of Ayurvedic products bought online found about one in five contained detectable lead, mercury or arsenic.^[2] More recently, a 2025 study measured thallium in shilajit and in commercial supplements.^[3] Contamination varies by product and batch, which is why batch testing is the most practical safety step; see heavy metals in shilajit.

Effects people commonly report

Outside formal trials, the effects people most often describe are mild: stomach upset, nausea, headache or feeling flushed. These reports are anecdotal and can’t be attributed to shilajit with confidence, but they are worth taking seriously. Allergic reactions, such as rash, itching or swelling, are rare with any supplement but need prompt attention. See side effects, including allergic reactions.

Why so few reports exist

Supplement side effects are under-reported. People may not link symptoms to a supplement, may not mention supplements to their doctor, or may stop taking the product without telling anyone. That means a small number of published reports could reflect limited reporting as much as genuine safety. Telling your GP or pharmacist that you take shilajit helps them spot patterns.

How to report a reaction in the UK

1. Stop taking the productAnd keep the jar, label and batch number.
2. Seek medical adviceYour GP, a pharmacist, or NHS 111; call 999 for severe reactions such as difficulty breathing.
3. Report itThe MHRA Yellow Card scheme accepts reports about herbal and complementary products, and food safety concerns can be reported to the Food Standards Agency.^[7]
4. Tell the sellerInclude the batch number so they can check their records.

Our full guide is how to report a shilajit problem.

How to reduce your risk

• Choose a batch-tested productWith metals and microbiology results; see reading a COA.
• Stay within the label servingSee studied doses vs label doses.
• Check medicines and conditionsSee interactions and existing conditions.
• Avoid in pregnancy and childhoodSee pregnancy and children.

What a convincing safety study would look like

Strong safety evidence would come from larger trials lasting a year or more, including older adults and people taking common medicines, with blood tests for kidney and liver function and systematic recording of side effects. Post-marketing surveillance, collecting reports from real-world users, would add another layer. None of this exists yet for shilajit, which is why we describe its safety record as reassuring but limited; see Is shilajit safe? What we actually know.

How to judge safety claims you see online

Phrases such as “completely safe”, “no side effects” or “safe for everyone” go further than the evidence. A responsible seller explains who shouldn’t take shilajit, points to its batch report and advises checking with a pharmacist. Overconfident safety claims are a warning sign, not a reassurance.

A note on our approach

We update this page as new studies or reports appear, and note changes on our updates log.

The bottom line

The published safety record of shilajit is reassuring but thin: small, short studies with no serious problems reported, and few case reports. The clearest documented risk is contamination, which varies by product. Use a batch-tested product, stay within the label serving, and report any suspected reaction.

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