Shilajit: What Is It and Does It Actually Work?

Shilajit is one of the more unusual substances in the supplement world — a tar-like resin that seeps from rocks in the Himalayas, Altai, and other mountain ranges during warmer months. It's been used in Ayurvedic medicine for thousands of years and described in ancient texts as a cure for nearly everything. Modern research hasn't confirmed that scope, but it has identified some genuinely interesting mechanisms that deserve serious consideration — alongside some serious safety concerns.

What Shilajit Is Made Of

Shilajit forms over millennia through the slow decomposition of plant material compressed between rock layers. It's roughly 60–80% organic matter, with the balance being minerals. The primary bioactive components are fulvic acid (accounting for 15–20% of its composition), humic acid, dibenzo-alpha-pyrones (DBPs), and over 80 trace minerals in ionic form.

Fulvic acid is the component that has received the most scientific attention. It's a low-molecular-weight compound that can cross cell membranes readily and appears to facilitate mineral transport into cells — which may explain why shilajit has traditionally been used as a carrier for other Ayurvedic herbs rather than solely on its own.

Testosterone and Reproductive Health

The most cited clinical study on shilajit is a 2015 double-blind, placebo-controlled trial published in Andrologia. Infertile men given 200mg of processed shilajit twice daily for 90 days showed significant increases in sperm count, motility, and total testosterone compared to placebo. Total testosterone increased by about 23%.

A separate 2015 trial used 500mg daily in healthy male volunteers aged 45–55 for 90 days. Free testosterone increased by approximately 19%, and DHEAS (a testosterone precursor) increased by about 31%. These are meaningful effects by supplement standards, though the studies are small (n=35–96) and have not yet been independently replicated at scale.

The proposed mechanism involves DBPs, which appear to support mitochondrial function in Leydig cells (the testosterone-producing cells in the testes), and fulvic acid's role in supporting CoQ10 activity — which in turn supports the energy metabolism required for steroidogenesis.

Mitochondrial Function and Energy

Shilajit's effects on mitochondria may be its most mechanistically credible benefit. Fulvic acid and DBPs appear to support the electron transport chain and CoQ10 activity. Animal and in vitro studies have demonstrated increased ATP production with shilajit supplementation.

A 2012 study found that shilajit with CoQ10 enhanced mitochondrial function more than either compound alone — suggesting synergy. This mitochondrial angle may explain reported benefits in fatigue, exercise performance, and altitude sickness (shilajit has historically been used by Himalayan climbers to reduce altitude-related symptoms, a claim supported by limited clinical evidence).

Cognitive Effects

Shilajit contains dibenzo-alpha-pyrones that inhibit acetylcholinesterase — the enzyme that breaks down acetylcholine. This is the same mechanism used by Alzheimer's drugs like donepezil. In vitro studies suggest it may also inhibit tau protein aggregation and beta-amyloid formation. Animal studies have shown cognitive improvements with shilajit supplementation.

Human clinical data for cognitive effects is essentially absent. The mechanistic data is interesting enough to warrant proper trials, but until those exist, cognitive claims remain speculative.

Heavy Metal Contamination Risk

This is the most serious concern with shilajit, and it cannot be understated. Raw or minimally processed shilajit from unregulated sources has been found to contain dangerous levels of lead, arsenic, mercury, and antimony. A 2012 analysis published in the Journal of Agricultural and Food Chemistry found that multiple commercial shilajit products had heavy metal content exceeding safe limits.

Proper processing — including purification steps that remove heavy metals while retaining bioactives — is essential. Only purchase from manufacturers who provide Certificates of Analysis from third-party labs specifically showing heavy metal testing. Avoid liquid resin products from unknown sources, and be especially skeptical of very cheap products.

Dosage and Forms

Clinical trials have used 200mg–500mg of processed, standardized shilajit daily. Resin form is often considered the most bioavailable, though standardized powders and capsules at 200–500mg are more practical. Most people split the dose into two administrations.

Shilajit should be dissolved in warm (not boiling) water or milk — heat above 40°C may degrade some bioactives.

FAQ

Is shilajit safe for long-term use? With high-quality, third-party tested products, available evidence suggests it's safe for periods of at least three months as studied in clinical trials. Long-term safety data beyond that is limited. Given the heavy metal contamination risk with low-quality products, sourcing is the primary safety determinant.

Does shilajit raise testosterone as much as TRT? No. The increases observed in trials (~19-23% in free testosterone) are significant by supplement standards but are modest compared to testosterone replacement therapy. It's best considered a support for healthy natural testosterone production in men with low-normal levels, not a treatment for clinical hypogonadism.

Can women take shilajit? Yes. While most research focuses on men's reproductive health, women may benefit from shilajit's mineral content, energy effects, and anti-inflammatory properties. Pregnant and breastfeeding women should avoid it due to insufficient safety data.

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