Shilajit Side Effects: A Evidence-Based Overview

Automated draft updated June 2, 2026

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Purified shilajit is generally well tolerated at studied doses, but unpurified or low-quality preparations carry meaningful risks—most notably heavy metal contamination. Understanding the difference between product quality and inherent compound effects is essential before supplementing.

What Is Shilajit and Why Does Preparation Matter?

Shilajit is a tar-like exudate harvested from high-altitude rock formations, particularly in the Himalayas. It contains fulvic acid, dibenzo-α-pyrones, and trace minerals. The form matters considerably: shilajit (purified), Primavie® purified shilajit, and shilajit resin refer to preparations that have undergone processing to remove contaminants, whereas raw or unprocessed shilajit (sometimes labelled asphaltum punjabinum) may retain heavy metals including arsenic, lead, and mercury at levels that exceed safe intake thresholds. Regulatory agencies including the FDA and Health Canada have issued warnings specifically about unpurified shilajit products.

Known and Potential Side Effects

Heavy metal toxicity is the most clinically significant risk and is directly tied to product purity. Case reports in the literature describe elevated blood lead levels in individuals consuming raw shilajit sourced from unregulated suppliers. Symptoms of heavy metal accumulation include fatigue, gastrointestinal distress, cognitive fog, and in severe cases neurological impairment.

Gastrointestinal effects such as nausea, loose stools, or mild stomach upset are occasionally reported, particularly when shilajit is taken on an empty stomach or at higher doses. These effects are typically transient and resolve with dose reduction or food co-administration.

Hormonal changes: Several small clinical trials have found that purified shilajit modestly increases total and free testosterone in healthy men. While this may be a desired effect for some users, individuals with hormone-sensitive conditions—including certain prostate conditions or polycystic ovary syndrome—should consult a clinician before use.

Iron overload: Shilajit has been shown to increase serum iron and ferritin in some studies. For most people this is not clinically significant, but individuals with haemochromatosis or other iron-metabolism disorders should monitor levels.

Uric acid elevation: Fulvic acid constituents may influence purine metabolism. People with gout or a history of hyperuricaemia should use caution and monitor uric acid levels.

Drug Interactions

There is limited but relevant evidence that shilajit may potentiate the effects of anticoagulants and drugs metabolised via cytochrome P450 pathways. If you are taking blood thinners, immunosuppressants, or drugs with a narrow therapeutic index, speak with a pharmacist or physician before adding shilajit to your regimen. Theoretical interactions also exist with iron-chelating therapies given shilajit's effect on iron absorption.

Dosage and Safety Thresholds

Most human clinical trials have used doses of 250–500 mg/day of standardised, purified shilajit extract. Studies up to 90 days in duration have not identified serious adverse events in healthy adults at these doses. Longer-term safety data remain limited. There is no established tolerable upper intake level. Children, pregnant women, and breastfeeding individuals should avoid shilajit due to insufficient safety data in these populations.

Key quality markers to look for on a certificate of analysis include:

Heavy metals below USP or WHO limits (lead <10 µg/day, arsenic <10 µg/day)
Standardised fulvic acid content (typically ≥50%)
Third-party testing verification

Practical Guidance

If you choose to use shilajit, select a clinically studied, purified form such as Primavie® purified shilajit or purified shilajit, start at the lower end of the studied dose range, and take it with food to minimise gastrointestinal discomfort. Discontinue use and seek medical advice if you experience unusual fatigue, joint pain, abdominal pain, or changes in urination.

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Frequently asked questions

Is shilajit safe to take every day?

Purified shilajit at 250–500 mg/day has been used safely in clinical trials lasting up to 90 days in healthy adults. Long-term daily use beyond this window lacks robust safety data, so periodic breaks and clinician check-ins are prudent. Product purity is the single most important safety variable.

Can shilajit cause heavy metal poisoning?

Raw or unpurified shilajit can contain elevated levels of arsenic, lead, and mercury, and case reports of heavy metal toxicity associated with unregulated products exist in the medical literature. Choosing a third-party-tested, purified preparation significantly reduces this risk. Always request a certificate of analysis from the manufacturer.

Does shilajit affect testosterone levels?

Several small randomised trials found that purified shilajit modestly increased total and free testosterone in men aged 45–55 over 90 days. This hormonal effect means people with hormone-sensitive conditions should exercise caution. The magnitude of effect is moderate and should not be extrapolated beyond the studied populations.

Who should avoid shilajit?

Pregnant and breastfeeding individuals, children, and people with haemochromatosis, active gout, or hormone-sensitive conditions should avoid shilajit or consult a healthcare provider before use. Those on anticoagulants or narrow-therapeutic-index medications should also seek medical advice due to potential interactions.