Shilajit Raised Testosterone 20 Percent in One 96-Man Trial. The Extract's Maker Supplied It, Nobody Has Replicated It, and One in Five Ayurvedic Products Tested Contained Heavy Metals.
Shilajit went from a niche Ayurvedic tonic to a fixture of men's health social media in about three years, sold as a black paste in small jars with a gold spoon. The marketing leans on a single number, a 20 percent rise in testosterone, and that number does come from a real randomized trial. What the marketing leaves out is that the trial is the only one of its kind, that it used a specific purified extract rather than the raw resin in most jars, that the extract's manufacturer was involved, and that the broader category of Ayurvedic mineral products has a documented heavy metal problem. This article walks through every human study of shilajit that matters for men, explains what the hormone data can and cannot support, and covers the product-quality evidence that should decide whether a given jar is worth taking at all.
Key Takeaways: What the Shilajit Evidence Actually Shows
Shilajit is a mineral-rich resin that seeps from mountain rock, chemically dominated by fulvic and humic acids plus compounds called dibenzo-alpha-pyrones, and it is sold in the United States as a dietary supplement, not an approved drug. The only randomized placebo-controlled trial of shilajit on testosterone, by Pandit and colleagues in Andrologia in 2016, enrolled 96 healthy men aged 45 to 55 and reported that 250 mg of a purified extract called PrimaVie taken twice daily for 90 days raised total testosterone by 20.45 percent, free testosterone by 19.14 percent and DHEA-S by 31.35 percent, all significantly more than placebo. Luteinizing hormone and follicle-stimulating hormone did not change in that trial, which means the mechanism behind the testosterone rise is not established. A 2019 randomized trial by Keller and colleagues in the Journal of the International Society of Sports Nutrition found that 500 mg of the same extract daily for 8 weeks helped 63 recreationally active men retain more strength after a fatiguing leg exercise protocol than placebo. Every published human trial of shilajit for men's health used the manufacturer's standardized extract, and none of the hormone findings has been independently replicated. Two JAMA studies by Saper and colleagues found detectable lead, mercury or arsenic in 20 percent of 70 Ayurvedic products bought in Boston stores in 2004 and in 20.7 percent of 193 bought online in 2008.
What is shilajit?
Shilajit is a brown to black, tar-like substance that exudes from rock crevices in high mountain ranges, mainly the Himalaya, the Hindu Kush, the Altai and the Caucasus, where it is also called mumijo or mumie. Geochemists generally describe shilajit as the product of plant and microbial matter decomposing over very long periods and being squeezed out of rock in warm months. In Ayurvedic texts such as the Charaka Samhita, shilajit is classed as a rasayana, a rejuvenating substance, and is recommended for fatigue, urinary complaints and male vitality. The composition of shilajit varies with where it is collected and how it is processed. Fulvic acid is the main bioactive fraction most researchers point to, alongside humic acid, dibenzo-alpha-pyrones, small amounts of amino acids and a long list of minerals including iron, calcium, magnesium and zinc. Raw shilajit also carries whatever else the rock and soil carried, which is why commercial suppliers purify it with water extraction and filtering. The extract used in nearly every modern human trial, PrimaVie from the US company Natreon, is standardized for fulvic acid and dibenzo-alpha-pyrone content so that each batch is chemically comparable.
Does shilajit increase testosterone in men?
One randomized placebo-controlled trial found that purified shilajit raised testosterone in healthy middle-aged men by about 20 percent over 90 days, and no second trial has tested the same question. The study is Pandit and colleagues, published in Andrologia in 2016 under the title Clinical evaluation of purified Shilajit on testosterone levels in healthy volunteers. The researchers enrolled 96 men aged 45 to 55 and randomly assigned them to take either 250 mg of PrimaVie or placebo twice a day for 90 consecutive days, with blood drawn at baseline and at days 30, 60 and 90. In the Pandit trial, the shilajit group showed significant rises compared with placebo in three hormones. Total testosterone rose by a reported 20.45 percent, free testosterone by 19.14 percent and dehydroepiandrosterone sulfate, the adrenal androgen precursor known as DHEA-S, by 31.35 percent. Luteinizing hormone and follicle-stimulating hormone, the two pituitary signals that drive the testes, stayed essentially flat. The authors reported no adverse events attributed to shilajit. A 20 percent rise is meaningful but needs context. For a man starting at 450 ng/dL, a 20 percent rise moves him to about 540 ng/dL, which is still within the normal adult range and well short of what testosterone replacement produces. The men in the Pandit trial were healthy volunteers, not men diagnosed with hypogonadism, so the trial says nothing direct about men with clinically low testosterone below the American Urological Association threshold of 300 ng/dL.
The One Placebo-Controlled Hormone Trial, in Three Numbers
Reported percentage rises from baseline in the shilajit arm of the 2016 Andrologia trial by Pandit and colleagues, in which 96 healthy men aged 45 to 55 took 250 mg of purified shilajit (PrimaVie) or placebo twice a day for 90 days. The differences from placebo were statistically significant for all three hormones. Luteinizing hormone and follicle-stimulating hormone did not change, and the extract was supplied by its manufacturer. One trial of this size is a signal, not a settled answer.
Why does it matter that LH and FSH did not change?
Unchanged LH and FSH in the Pandit trial mean shilajit did not appear to raise testosterone by telling the pituitary to push harder on the testes, which is the route used by drugs such as clomiphene and enclomiphene. When testosterone rises without a rise in LH, the explanation has to sit somewhere else: more efficient production inside the Leydig cells, slower breakdown or clearance of testosterone, a shift in binding proteins, or a contribution from adrenal androgens, which fits the 31 percent rise in DHEA-S. None of those mechanisms was tested directly in shilajit research on humans. Animal work has reported antioxidant effects in testicular tissue and better mitochondrial function, and some researchers have proposed that the dibenzo-alpha-pyrones support coenzyme Q10 activity in mitochondria. Those are hypotheses built from rodent and cell studies. For a man reading the Pandit paper, the practical point is narrower: the reported testosterone rise is real data from a controlled trial, and the explanation for it is still unknown. The lack of an LH rise also has a reassuring side. Shilajit did not appear to suppress the hypothalamic-pituitary-gonadal axis in the Pandit trial, which is the main reason exogenous testosterone reduces sperm production. A supplement that leaves LH and FSH alone is unlikely to shut down the testes, though that has not been measured over periods longer than 90 days.
How strong is the overall evidence for shilajit in men?
The human evidence for shilajit in men is thin: four small studies, two of them randomized and placebo-controlled, all using a standardized extract from a single manufacturer. The Pandit testosterone trial with 96 men is the largest. The Keller strength trial with 63 men is the second randomized study. The other two had no placebo group at all. The Biswas fertility study, published in Andrologia in 2010, gave 100 mg of processed shilajit twice a day for 90 days to 60 men with low sperm counts, and fewer than half of them finished the protocol. Among completers, the authors reported total sperm count up 61.4 percent and serum testosterone up 23.5 percent, along with better sperm motility. Without a placebo group, those changes cannot be separated from regression to the mean, seasonal variation or the effect of being in a study, because men are usually enrolled in infertility research when their counts are at their lowest. The Das study, published in Scientific Reports in 2016, gave 500 mg a day for 12 weeks to about two dozen overweight or obese adults and took muscle biopsies before and after. Shilajit was associated with higher expression of genes involved in the extracellular matrix of skeletal muscle, the connective scaffolding that transmits force. Gene expression is a mechanistic signal, not a measure of strength, size or performance. Compared with other testosterone herbs covered on this site, shilajit has far fewer trials than ashwagandha and roughly the same thin, single-manufacturer pattern as tongkat ali, but without tongkat ali's regulatory red flag.
The Whole Human Record Fits in Four Small Studies
Participants enrolled in the four human studies of purified shilajit most often cited for men's health. Blue bars are randomized and placebo-controlled; amber bars had no placebo group. Only the Pandit trial measured testosterone against a placebo. The Biswas fertility study enrolled 60 infertile men but fewer than half completed the 90 days, and the Das muscle study measured gene expression, not strength or hormones.
Does shilajit improve strength or recovery?
In one randomized trial, 500 mg of shilajit a day for 8 weeks helped recreationally active men retain more of their strength after an exhausting leg workout, but it did not make them stronger at baseline. The study is Keller and colleagues, published in the Journal of the International Society of Sports Nutrition in 2019. Sixty-three men were randomized to 250 mg of PrimaVie, 500 mg of PrimaVie or placebo daily for 8 weeks. Before and after supplementation, the men in the Keller trial performed a fatiguing protocol of 50 maximal leg extensions on an isokinetic machine, and maximal isometric strength was measured before and after the fatigue bout. After 8 weeks, the 500 mg group lost less maximal strength during the protocol than the placebo group, while the 250 mg group did not differ meaningfully from placebo. Baseline levels of hydroxyproline, a breakdown product of collagen used as a rough marker of connective tissue turnover, were lower in both shilajit groups. The Keller result fits with the Das gene expression findings, since both point toward connective tissue rather than muscle fibre size. Taken together, the strength data suggest a possible benefit for fatigue resistance at 500 mg a day, from one trial with roughly 20 men per arm. The Keller trial did not measure testosterone, so it cannot confirm the Pandit hormone result.
Doses Used in the Human Studies
Daily amount of purified shilajit extract in each study. Every one used a standardized, manufacturer-supplied extract, not raw resin, so these doses do not translate directly to the tar-like product sold in jars. The 500 mg daily dose in the Pandit and Keller trials was given as 250 mg twice a day or as a single serving, depending on the protocol.
Is shilajit safe?
Purified, lot-tested shilajit extracts have not produced serious adverse events in published human trials lasting up to 90 days, but raw and unregulated shilajit products carry a real risk of heavy metal contamination. The Pandit, Keller and Biswas trials all reported shilajit as well tolerated, and a 2014 review by Stohs in Phytotherapy Research concluded that the available clinical data showed no safety signal at the doses studied. Those trials were short and small, so rare or long-term effects would not have been detected. The bigger safety question for shilajit is what is actually in the jar. Saper and colleagues published two studies in JAMA on Ayurvedic products. In 2004 they bought 70 Ayurvedic herbal medicine products from 30 stores in the Boston area and found that 14 of them, or 20 percent, contained lead, mercury or arsenic. In 2008 they bought 193 products online and found detectable metals in 20.7 percent, with contamination rates of 21.7 percent in US-made products and 19.5 percent in Indian-made products. Products from the rasa shastra tradition, which adds metals on purpose, were contaminated 40.6 percent of the time. Shilajit is a geological material that concentrates minerals, so heavy metals are a predictable concern unless the product has been purified and tested batch by batch. Unprocessed shilajit can also carry fungal contamination and free radicals from the rock. A man considering shilajit should look for a standardized extract with a published certificate of analysis showing lead, mercury, arsenic and cadmium results from an independent laboratory. Shilajit contains iron, which matters for men with hereditary hemochromatosis or high ferritin. Men taking blood pressure medication or diabetes medication should check with a doctor, because animal studies have reported effects on blood pressure and glucose.
One in Five Ayurvedic Products Tested Contained Heavy Metals
Percentage of Ayurvedic products containing detectable lead, mercury or arsenic in two JAMA studies by Saper and colleagues. In 2004, 14 of 70 products from Boston-area stores were contaminated. In 2008, 20.7 percent of 193 products bought online contained metals, rising to 40.6 percent among rasa shastra formulations that add metals deliberately. US-made products were no cleaner than Indian-made ones. Shilajit is a mineral-rich resin and carries the same category risk unless lot-tested.
Is raw shilajit resin the same as the extract used in studies?
No, the raw resin sold in jars is not the same product tested in the human trials, and the trial doses do not translate directly. Every major human study of shilajit used PrimaVie, a water-extracted, purified powder standardized for fulvic acid and dibenzo-alpha-pyrone content. Raw resin varies from batch to batch in moisture, fulvic acid concentration and mineral load, so a pea-sized scoop of resin has no fixed equivalent to 250 mg of a standardized extract. The word purified on a shilajit label is not regulated, and there is no US federal standard for shilajit identity or potency. Under the Dietary Supplement Health and Education Act of 1994, manufacturers do not have to prove purity or efficacy before sale. That leaves the buyer relying on third-party testing. The most useful documents are a certificate of analysis for heavy metals and microbial contamination, and a stated fulvic acid percentage measured by a named method.
Who might reasonably try shilajit, and who should not?
A healthy man in his forties or fifties with normal testosterone who wants to test a low-risk supplement could reasonably try a lot-tested standardized shilajit extract at the studied dose of 250 mg twice a day for about 90 days, with blood work before and after. That plan mirrors the Pandit trial design and gives a personal answer rather than a guess. Testing total and free testosterone, sex hormone binding globulin and ferritin at baseline and at 12 weeks shows whether anything moved. Shilajit is a poor choice for a man with symptoms of hypogonadism and testosterone below 300 ng/dL. A 20 percent rise from 220 ng/dL lands at about 265 ng/dL, still low, and delaying a proper workup can miss causes such as pituitary disease, sleep apnea or obesity that need their own treatment. Men with hemochromatosis, kidney disease, or a history of heavy metal exposure should avoid shilajit, and anyone trying to conceive should discuss it with a fertility specialist given that the sperm data come from an uncontrolled study. Shilajit should not be combined with the expectation that it will match testosterone replacement therapy. TRT typically raises testosterone by several hundred ng/dL, while the single shilajit trial reported a 20 percent rise in men who were not deficient to begin with.
The Shilajit Record on One Axis
Every strand of the shilajit evidence arranged as a single schematic map. Blue marks what the evidence supports, amber marks real limits that do not sink the case, slate marks problems that count against it, and dark grey marks claims the evidence does not carry. One manufacturer-supported trial found a modest testosterone rise in middle-aged men, no one has replicated it, and product contamination is a documented risk.
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