Shilajit
Shilajit: why its composition and origin are not well characterized, what a single small trial reported for testosterone, and why contaminant and heavy-metal questions need caution.
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Overview and identity
Shilajit is a soft, black natural material used for thousands of years in traditional medicine. A 2025 review found that its chemical composition is not known with certainty, no comprehensive chemical analysis has ever been performed, and its source is not known: some believe it forms from dead plant residues or animal excrement, others that it is a mineral secreted from rock. [1] Composition differs between regions, with more than 80% of weight being humic substances and about 20% calcium, potassium and magnesium, plus amino acids, fatty acids, bioactive compounds such as caffeic and gallic acid, and heavy metals including chromium, selenium and cobalt. [1]What the research shows
A randomized, double-blind, placebo-controlled study of purified shilajit (250 mg twice daily for 90 days) in healthy volunteers aged 45 to 55 reported significantly increased total and free testosterone and DHEAS compared with placebo. [2] This is a single small study of a purified product, so it does not apply to other shilajit products.Safety and quality
Because composition and source are not well characterized, and the review reports heavy metals among its components, product quality is a real question. We found no readable source on contamination testing of marketed products, adverse events or interactions, so we make no claim that it is safe. Ask a pharmacist, and be especially cautious with unlabeled or poorly sourced resin products.Frequently asked questions
What is shilajit?
A black natural material whose composition and origin are not well established. [1]
References
- Kamgar E, Kaykhaii M, Zembrzuska J. A Comprehensive Review on Shilajit: What We Know about Its Chemical Composition. Crit Rev Anal Chem. 2025;55(3):461-473. PubMed 38133965.
- Pandit S, et al. Clinical evaluation of purified Shilajit on testosterone levels in healthy volunteers. Andrologia. 2016;48(5):570-575. PubMed 26395129.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.