Shilajit does appear to increase testosterone, though the evidence comes from a small number of human studies. In the most cited clinical trial, healthy men who took purified shilajit for 90 days showed statistically significant increases in both total and free testosterone compared to a placebo group. The effect is real but modest, and the research base is still thin enough that you should set realistic expectations.
What the Clinical Evidence Shows
The key study, published in Andrologia in 2016, gave purified shilajit to healthy male volunteers aged 45 to 55 for 90 consecutive days. Compared to the placebo group, the men taking shilajit had significantly higher total testosterone, free testosterone, and DHEAS, a precursor hormone that your body converts into both testosterone and estrogen. The results were statistically significant, meaning they were unlikely to be caused by chance.
What makes this finding interesting is that the signaling hormones that tell the testes to produce testosterone (LH and FSH) stayed the same in both groups. That suggests shilajit isn’t working by ramping up hormonal signals from the brain. Instead, it may be supporting the testosterone-producing cells in the testes directly, or reducing the breakdown of testosterone already in circulation. The exact mechanism hasn’t been pinned down yet.
A separate study looked at men with low sperm counts and found that processed shilajit taken over 90 days increased total sperm count by 61.4%, sperm quality by 37.6%, and motility by 12 to 17%. These fertility improvements often go hand in hand with healthier testosterone levels, and the study reinforces the idea that shilajit has a meaningful effect on male reproductive function.
How Long It Takes to Work
Both major clinical trials measured outcomes after 90 days of consistent daily use. There’s no published human data showing significant testosterone changes at shorter time frames like two or four weeks. If you decide to try shilajit, plan on at least three months of daily use before evaluating whether it’s doing anything for you. Supplements that promise hormonal shifts in days or weeks aren’t backed by the science here.
Realistic Expectations
It’s worth being honest about the limits of the research. The clinical trials involved small groups of men, and the results haven’t been replicated across large, diverse populations. Shilajit is not going to produce anything close to the hormonal shift you’d see from testosterone replacement therapy. For men with clinically low testosterone causing symptoms like fatigue, low libido, or muscle loss, shilajit alone is unlikely to be a solution.
Where shilajit fits more plausibly is as a mild, supportive supplement for men whose testosterone is within a normal but declining range, particularly men in their 40s and 50s. The participants in the main study were healthy volunteers in that age bracket, not men diagnosed with hormonal disorders. Think of it as a potential nudge, not a fix.
The Heavy Metal Problem
Shilajit is a natural mineral pitch that seeps from rocks in mountainous regions, and it naturally contains around 65 heavy metals, including lead, arsenic, cadmium, and mercury. That’s a serious concern if you’re buying a product that hasn’t been properly purified. A 2024 review in Frontiers in Pharmacology emphasized that consuming shilajit without knowing the heavy metal levels is unsafe and could cause real health problems.
Shilajit does contain compounds called humic substances that can bind and neutralize some of these toxic metals, roughly 12 of them. But the research on how effectively this natural detoxification works is still unclear. The WHO and FDA set specific limits for heavy metals in herbal products: no more than 0.2 to 0.3 parts per million for cadmium, 1 ppm for mercury, and 10 ppm for arsenic and lead. If a product doesn’t publish third-party lab results showing it falls within these limits, skip it.
What to Look for in a Product
The clinical studies used purified shilajit, which means the raw material went through processing to reduce heavy metal content and standardize the active compounds (primarily fulvic acid and dibenzo-alpha-pyrones). When shopping, look for products that specify “purified” on the label, provide a certificate of analysis from an independent lab, and list heavy metal test results. Resin forms tend to be closer to what was used in research than capsules filled with powder, though both exist in purified versions.
Avoid raw or unprocessed shilajit sold online from unregulated sources. The difference between purified and unpurified shilajit isn’t a marketing distinction. It’s a safety one. The same compound that showed testosterone benefits in a controlled study could be genuinely harmful if it’s loaded with lead or mercury.
Who Might Benefit Most
Based on the available evidence, the strongest case for trying shilajit is if you’re a man over 40 looking for general reproductive and hormonal support as part of a broader health routine. The fertility data is particularly encouraging for men with low sperm counts, where improvements in count, motility, and quality were all substantial after 90 days.
If your primary goal is raising testosterone significantly, the more reliable levers remain the basics: strength training, adequate sleep (seven to nine hours), maintaining a healthy body fat percentage, managing stress, and getting enough zinc and vitamin D. Shilajit could complement those habits, but it’s not a substitute for any of them.