Shilajit, the sticky, tar-like substance that seeps from rocks in the Himalayas and other mountain ranges, has been used in Ayurvedic medicine for centuries. Today it is marketed as a natural testosterone booster, usually with far more confidence than evidence. One randomized, double-blind, placebo-controlled trial is worth a closer look, because it tested a purified shilajit extract against placebo and measured actual hormone levels.
What the Study Did
The paper, by Pandit and colleagues, was published in Andrologia in 2016. It evaluated purified Shilajit, described as an Ayurvedic rasayana (a rejuvenating tonic), in healthy male volunteers aged 45 to 55. Participants took 250 mg twice daily for 90 consecutive days. The design was randomized, double-blind and placebo-controlled, which is the standard format for separating a real supplement effect from expectation and chance.
The researchers focused on male androgenic hormones. The key outcomes were total testosterone, free testosterone and dehydroepiandrosterone sulfate (DHEAS). They also tracked the gonadotropic hormones, luteinizing hormone (LH) and follicle-stimulating hormone (FSH).
What They Found
According to the abstract, 90 days of Shilajit significantly (P < 0.05) increased total testosterone, free testosterone and DHEAS compared with placebo. LH and FSH were "well maintained," meaning they stayed stable rather than rising or falling in a notable way.
The abstract reports statistical significance but no effect sizes, so this article won't put numbers on the size of the increase. Anyone quoting a specific percentage rise should check the full paper rather than rely on supplement marketing.
Why the LH and FSH Result Matters
LH is the pituitary signal that tells the testes to produce testosterone. If a compound raises testosterone while LH climbs sharply, that might suggest the body is compensating for something. If testosterone rises while LH and FSH stay flat, the picture is less clear. It could point to a mechanism that doesn't simply amplify the pituitary signal, but the abstract doesn't explain why this happened. Treat any mechanistic story as speculation unless the full paper supports it.
The DHEAS finding is also interesting. DHEAS is an adrenal androgen precursor that declines with age, so a rise in men in their late 40s and 50s is at least consistent with the idea that Shilajit may affect androgen status broadly rather than testosterone alone.
Important Caveats
This is a promising result, but it has real limits:
- Modest sample. The trial was not a large, multi-center study. Small trials can produce results that don't replicate, and one study is not a consensus.
- Middle-aged men, not young lifters. Participants were 45 to 55. Testosterone typically drifts downward with age, so a supplement might show more room to move in this group than in a 22-year-old with already robust levels. These results shouldn't be extrapolated to young athletes.
- Hormone levels are not performance. The abstract reports hormone markers. It does not report gains in muscle mass, strength, libido or body composition, so don't assume a higher number on a lab test translates into visible gym results.
- Healthy volunteers. The study doesn't speak to men with diagnosed hypogonadism or other medical conditions.
- Purified extract. The trial used a purified Shilajit preparation as described in the paper. The result may not carry over to raw resin, random capsules or unverified products.
Practical Takeaways
Dose and duration: The studied protocol was 250 mg twice daily (500 mg total per day) for 90 days. That is a defined, specific regimen, so there's little reason to megadose beyond it. Higher doses haven't been shown here to do anything extra.
Quality matters. Shilajit is a natural material harvested from mountain rock, and unprocessed or poorly processed material can carry heavy metals, fulvic acid variability and other contaminants. That is the main reason the study's use of a purified extract matters. When shopping, look for products that clearly state they are purified and that provide third-party lab testing, ideally including heavy-metal screening (lead, arsenic, cadmium, mercury). A product that can't show a certificate of analysis is a gamble.
Who it might be for: Based on this trial, the most relevant audience is healthy men in their late 40s to mid-50s curious about supporting androgen levels. Younger men, men on testosterone therapy and men with medical conditions affecting hormones should be cautious about drawing conclusions from this paper. Anyone with a thyroid, prostate, iron-related or hormone-sensitive condition, or anyone on medication, should speak to a physician first. If you suspect low testosterone, get proper blood work rather than guessing with supplements.
The Bottom Line
This randomized, placebo-controlled trial offers genuine, if preliminary, evidence that purified Shilajit at 250 mg twice daily for 90 days can raise total testosterone, free testosterone and DHEAS in healthy middle-aged men, without disturbing LH and FSH. That makes it more credible than most "natural T booster" claims, which rest on tradition or test-tube data. But a modest trial in one age group is a starting point, not a verdict. Larger replications, outcome measures like strength and body composition, and long-term safety data would be needed before anyone can call Shilajit a proven testosterone solution.
