Shilajit: Benefits, Dosage, Best Forms & Safety

What Is Shilajit?

Shilajit is a sticky, tar-like substance that seeps from rock crevices in high-altitude mountain ranges, primarily the Himalayas, and also the Caucasus and Altai ranges, formed over long periods from the slow decomposition of plant material trapped in rock. It has centuries of traditional use in Ayurvedic medicine as a general rejuvenative tonic.

Purified shilajit is valued mainly for its fulvic acid content, a humic substance believed to help the body absorb minerals, along with trace minerals and small amounts of compounds called dibenzo-alpha-pyrones. Raw, unprocessed shilajit collected directly from rock can also carry unwanted material if it is not properly filtered, which is central to the safety concern discussed below.

Evidence-Based Benefits

• Testosterone in middle-aged men (one randomized trial). A randomized, double-blind, placebo-controlled trial in 96 healthy men aged 45 to 55 (75 completed the study) found that 250 mg of purified shilajit taken twice daily for 90 days raised total testosterone by about 20% and free testosterone by about 19% versus placebo, with DHEAS also rising significantly. This is a genuinely positive signal, but it comes from a single trial by one research group and has not yet been independently replicated.
• Traditional use as an energy and vitality tonic. Shilajit has a long history of traditional use in Ayurvedic and Tibetan medicine as a general anti-fatigue tonic, though traditional use is a different kind of evidence than a controlled clinical trial.
• Mineral absorption (mechanistic research). Laboratory research suggests fulvic acid, shilajit’s main marker compound, may help transport minerals across cell membranes, but this mechanistic work has not been well translated into human outcome trials beyond the testosterone study above.
• Antioxidant activity (preclinical). Cell and animal studies suggest shilajit has antioxidant properties, but as with the mineral-transport research, this has not been confirmed in dedicated human trials.

Dosage Guide

• Standard Dose: The one published human trial used 250 mg of purified shilajit twice daily (500 mg/day total) for 90 days. Commercial products commonly recommend 300-500 mg/day of purified resin or extract, though doses in that specific range have not themselves been directly tested in a published trial.
• Upper Limit (UL): No official UL has been established by NIH ODS or any regulatory body; shilajit is not an essential nutrient, so there is no government-set safety ceiling.
• Timing: Most products recommend once or twice daily with food; the trial above used a twice-daily split-dose protocol.
• Notes: Third-party lab testing on the label matters more for shilajit than for most other ingredients in this library, because of the contamination issue discussed below.

Drug & Supplement Interactions

• Iron supplements or hemochromatosis (Medium): Shilajit naturally contains trace minerals, including iron, so people with hemochromatosis (an iron-overload condition) or those already taking iron supplements should be cautious and discuss use with a doctor.
• Hormone therapy or hormone-sensitive conditions (Low to Medium): Because the available trial showed a real increase in testosterone and DHEAS, anyone on prescribed hormone therapy or with a personal history of a hormone-sensitive cancer should talk to a doctor before use.
• Chronic prescription medication generally (Low, limited data): Long-term interaction data with common prescription medications does not exist for shilajit; anyone on chronic medication should mention shilajit use to their prescriber as a general precaution.

Safety & Side Effects

In the published randomized trial, purified shilajit at 250 mg twice daily for 90 days was well tolerated, with no more adverse events reported than in the placebo group. That single study is a limited guide to real-world safety, however, because the shilajit sold on the open market varies enormously in purity and processing compared with a purified, laboratory-controlled research product.

The most significant documented concern with shilajit is contamination in poorly purified or unregulated raw product. A 2026 Bloomberg investigation into shilajit supplements sold in the U.S. market found some products contaminated with lead and other heavy metals, along with industrial fillers such as tar, asphalt, coal, and fertilizer, and, in some cases, animal droppings from pika (small mountain rodents whose droppings collect on the same cliffsides where shilajit forms and can be mistaken for the resin itself). The investigation found that some sellers skip the labor-intensive, multi-day filtering process required to properly separate and purify genuine resin. This is a real, documented sourcing risk, not a reason to say shilajit itself is inherently dangerous when properly purified and tested.

Bottom Line

Shilajit has genuinely interesting, if thin, human evidence: one well-designed trial showing a real testosterone increase in middle-aged men over 90 days. That is more than many trendy testosterone-support ingredients can claim, but it is still only one trial, and the ingredient’s biggest real-world risk is less about the compound itself and more about sourcing and purity. Anyone considering shilajit should prioritize verified, third-party-tested products over price, and should not expect the dramatic results implied by some marketing.

Frequently Asked Questions

Q: Does shilajit actually raise testosterone?
A: One 90-day, placebo-controlled trial in men aged 45 to 55 found a meaningful increase in testosterone and DHEAS. That is a promising, credible result, but it comes from a single study, so it should be viewed as preliminary rather than proven.

Q: Is shilajit safe?
A: Purified shilajit used in the available research trial was well tolerated. The bigger safety concern is with unpurified or poorly tested commercial products, which a 2026 Bloomberg investigation found could contain lead, other heavy metals, industrial fillers, and even animal waste. Choosing a third-party-tested, GMP-manufactured product materially reduces this risk.

Q: How is shilajit different from other testosterone-support ingredients like tongkat ali or fadogia agrestis?
A: All three are marketed heavily as natural testosterone boosters, but they have different evidence bases and different key risks. Shilajit’s strongest evidence is a single positive human trial, with contamination as its main safety concern. See our Tongkat Ali guide and Fadogia Agrestis guide for how their evidence and risk profiles compare.

Q: Who should avoid shilajit?
A: People with hemochromatosis or other iron-overload conditions, anyone on hormone therapy or with a hormone-sensitive cancer history, pregnant or breastfeeding people, and anyone unable to verify a product’s third-party heavy-metal testing should avoid it or talk to a doctor first.

Sources

• Pandit S, et al. “Clinical evaluation of purified Shilajit on testosterone levels in healthy volunteers.” Andrologia (2016).
• Bloomberg (2026): “Shilajit, MAHA’s Himalayan Testosterone Supplement, Is Suspiciously Cheap” – investigation into contamination in U.S.-market shilajit supplements.
• NIH National Center for Complementary and Integrative Health (NCCIH): general herbal supplement safety framework.