Shilajit — pronounced “shil-uh-jeet” — is a tar-like resin that seeps out of high-altitude rocks across the Himalayas, the Caucasus, and the Hindu Kush. It’s one of the more heavily studied substances in Ayurvedic medicine, and unlike a lot of traditional remedies, a handful of its most-touted uses actually have human clinical trials behind them — sperm health and testosterone in particular. That said, shilajit has also picked up a reputation online as a fix for pretty much everything from hair loss to diabetes, and most of that reputation isn’t backed by research. This guide sticks to what’s actually been studied, tells you plainly when something is still just traditional use, and covers the dosage and safety info you need before buying any.
Quick Summary
Shilajit’s best-evidenced use is male reproductive health: a 90-day human trial found it significantly improved sperm count and testosterone in men with low sperm counts, and a separate trial found similar testosterone gains in healthy older men. Smaller human studies also point to modest cholesterol improvements. Most of shilajit’s other reputed benefits — including some of the claims this site previously made — come from animal studies, lab (in-vitro) research, or traditional Ayurvedic use rather than human trials, so we’ve labeled each one accordingly below. The single biggest safety issue with shilajit isn’t the resin itself; it’s heavy-metal contamination in poorly purified products, so sourcing matters more than almost anything else here.
What is Shilajit?
Shilajit is a waxy, resin-like substance found in mountainous rock at elevations of roughly 1,000 to 5,000 meters, most commonly in India, Nepal, Pakistan, Tibet, and Russia. In the summer heat, it oozes out from between rock layers as organic plant matter and minerals slowly decompose, which is when it’s harvested. Raw shilajit resin is pale brown to black, has a bitter taste, and smells faintly of bitumen. It’s also sold as salajeet, mumie, or mummiyo. While the raw resin can be bought directly, most people today take it as a powder or capsule instead, largely because the taste is an acquired one.
 | Buy Shilajit on Amazon! |
Up to 80% of shilajit’s dry weight is made up of humic substances, with fulvic acid as the dominant component. Fulvic acid is a naturally occurring compound formed when organic material breaks down, and it’s the piece of shilajit that most of the research below actually points back to — it’s a small molecule that the body absorbs easily, and it carries trace minerals, electrolytes, and antioxidant compounds along with it.
In Ayurveda, shilajit is described as a “conqueror of mountains and destroyer of weakness” and shows up in the Charaka Samhita, one of Ayurveda’s foundational texts, as a strength and vitality tonic. That traditional reputation is exactly why researchers have taken a closer look at it over the past couple of decades — and why it’s worth being honest about which parts of that reputation now have clinical trials behind them, and which parts are still just tradition.
Shilajit Benefits and Uses
In Ayurveda, shilajit was considered a “conqueror of mountains and destroyer of weakness.” It was primarily used as a strength and vitality enhancer, and is mentioned in the Charaka Samhita, the main text of Ayurveda. Although there are few clinical trials that reliably prove shilajit’s benefits, studies back up some of its traditional uses as well as other potential benefits, including the following:
May Support Male Fertility and Sperm Health
This is shilajit’s strongest evidence, full stop. In a 90-day human clinical trial, 28 men with low sperm counts (oligospermia) took 100mg of processed shilajit twice daily. By the end of the trial, total sperm count had increased by 61.4%, sperm motility improved, and serum testosterone rose by 23.5% compared with baseline — with no reported changes in liver or kidney function that would suggest the dose wasn’t safe.[1] It’s one small trial, so it’s not the final word, but it’s a real human RCT with real numbers, which puts it well ahead of most of the other claims on this page.
May Raise Testosterone Levels
A separate 90-day, randomized, double-blind, placebo-controlled trial gave 75 healthy men aged 45–55 either 250mg of purified shilajit or a placebo, twice a day. The shilajit group saw significant increases in total testosterone, free testosterone, and DHEAS compared to placebo, while LH and FSH (the hormones that regulate testosterone production) stayed steady — meaning shilajit didn’t appear to be forcing an artificial spike, just supporting the body’s normal production.[2] Human data at this quality level is genuinely uncommon for a traditional supplement, which is part of why shilajit gets so much attention in this space.
May Improve Cholesterol and Triglyceride Levels
In a small human study, 20 healthy volunteers took 2 grams of shilajit daily for 45 days. Researchers found significant reductions in triglycerides, total cholesterol, and LDL (“bad”) cholesterol, along with a rise in HDL (“good”) cholesterol, with no significant changes in blood pressure or other vital signs over that period.[3] It’s a small, older study without a placebo control, so treat it as a promising early signal rather than settled science — a decent-sized RCT would go a long way toward confirming it.
May Ease Pain Perception
Animal studies — not human ones — have found that shilajit can blunt pain response. In mouse studies using standard pain-response tests, animals given shilajit showed reduced pain reactions, and separate research found that low doses of shilajit reduced the amount of morphine mice needed for pain relief.[4] Worth being clear here: this doesn’t make shilajit a painkiller on its own, and none of this has been tested in humans yet.
Antioxidant Support, via Fulvic Acid
Fulvic acid, shilajit’s main active component, has documented antioxidant and anti-inflammatory properties in lab and animal research, and the human cholesterol study above also noted improved antioxidant markers in participants after 45 days of shilajit use.[3] This is more of a mechanism than a standalone “benefit” — it’s the likely explanation behind several of shilajit’s other effects, rather than something you’d feel directly.
Topical Fulvic Acid May Help Eczema Symptoms
A small, double-blind, placebo-controlled human trial found that a topical, lab-derived fulvic acid formulation improved eczema symptoms more than standard emollient therapy alone over two weeks, with only a mild, short-lived burning sensation reported as a side effect.[5] One important caveat: this study used a specific carbohydrate-derived fulvic acid product, not shilajit resin itself, so it’s fair evidence for fulvic acid broadly but not direct proof that rubbing shilajit resin on your skin will do the same thing.
Early-Stage Lab Research on Brain Health (Not a Treatment)
You may see shilajit connected online to Alzheimer’s disease, usually citing fulvic acid’s effect on a protein called tau. That research is real, but it’s important to be precise about what it actually shows: a single in-vitro (test tube) study found that fulvic acid could inhibit tau protein clumping and help break apart existing tau clumps in a lab dish.[6] That’s an interesting early finding for basic neuroscience research — it has not been tested in animals or humans, and shilajit is not a treatment, prevention, or cure for Alzheimer’s disease or any other neurodegenerative condition. If you’re researching brain health for yourself or a family member, this is worth flagging to a doctor rather than treating as established fact from a supplement blog.
Traditional Ayurvedic Uses (Not Clinically Confirmed)
Beyond what’s been formally studied, shilajit has a long history in Ayurveda as a general vitality tonic — traditionally used for fatigue, altitude sickness, digestive complaints, and as an adaptogen alongside herbs like ashwagandha. Some people also describe it supporting mood and stress resilience, though there’s no human trial specifically testing shilajit against mood outcomes the way there is for testosterone or fertility — if that’s your main interest, our guide to natural mood stabilizers covers herbs with more direct research behind them. Eastern European strength athletes have also reportedly used shilajit as part of “herbal stacks” for recovery, though this is anecdotal rather than trial-based. None of this makes shilajit useless — traditional use over centuries counts for something — but it’s a different tier of evidence than the testosterone and fertility trials above, and it’s worth knowing the difference.
| | Buy Shilajit on Amazon! |
Shilajit Side Effects and Safety
Clinical studies using purified, standardized shilajit at doses up to 2 grams per day for periods of 45 to 90 days haven’t reported serious toxicity or organ changes.[1],[2],[3] That’s reassuring, but it’s specifically true of purified, tested shilajit — the bigger real-world risk with this herb isn’t the resin itself, it’s contamination.
A few practical safety points:
- Heavy metals are the real concern. Because shilajit forms in direct contact with rock, unpurified or poorly sourced products have been found to contain lead, mercury, and arsenic. Health Canada has issued advisories warning consumers about heavy-metal contamination in certain Ayurvedic products, including some shilajit products — that’s a product-safety warning about specific contaminated items, not a blanket ban on shilajit. Buy from brands that publish third-party heavy-metal testing.
- Raw, unprocessed shilajit can carry fungal contaminants such as Aspergillus niger, so it should be avoided unless it’s been properly purified.
- Don’t take it with chlorinated water — chlorine can react with the fulvic acid content.
- May lower blood sugar and blood pressure, so talk to a doctor first if you’re on medication for either.
- Avoid if you have phenylketonuria (shilajit contains trace phenylalanine) or a history of high uric acid/gout, since shilajit may raise uric acid levels.
- Avoid during pregnancy or if immunocompromised — there’s no safety research covering either group.
How to Take Shilajit
Traditionally, shilajit was eaten with milk at breakfast time. Today, it is often found in capsule or powder form for convenience, with one or two capsules taken
per day as a continuous supplement. It has been found that some people respond better to shilajit than others, so if you have been taking it for two months with no obvious effects, you may want to stop and move on to another herb.
Shilajit and fulvic acid have an unpleasant taste, so you might find it easier to consume
them with food. This is also a safety measure you may want to take, as shilajit is best begun in a small, diluted dose, in case of any unexpected side effects and to allow your body to adjust.
Recommended Dosage
The human trials above used doses ranging from 100mg to 250mg twice daily (roughly 200–500mg/day) for testosterone and fertility support, and up to 2 grams/day for the cholesterol study. Most commercial shilajit products recommend 300–500mg per day as a general starting point — start on the lower end, especially with resin or powder forms, since the taste and texture take some adjusting to. It’s traditionally taken dissolved in warm water or milk, and taking it with food can help offset the taste and ease digestion. Studies showing benefits ran 45 to 90 days, so give it at least two to three months before deciding whether it’s working for you.
Conclusion
Shilajit is one of the rarer traditional supplements where “backed by science” is actually true for at least part of its reputation — the testosterone and male fertility research is genuinely solid for a natural product. But it’s also picked up a much bigger reputation than the evidence supports, and this article previously overstated some of that. Shilajit isn’t a cure or treatment for any disease, and claims connecting it to conditions like Alzheimer’s or diabetes are, at best, early lab findings dressed up as settled facts. Used sensibly — from a source that tests for heavy metals — it’s a reasonably well-studied option worth considering for testosterone and reproductive health specifically, with a longer list of traditional uses that simply haven’t been put through a clinical trial yet.
FAQs
There’s real evidence for this one. A 90-day randomized, placebo-controlled trial in 75 healthy men aged 45–55 found significant increases in total and free testosterone compared to placebo.[2] It’s one of shilajit’s best-supported claims, though more trials in broader age groups would strengthen the picture.
Studies using purified shilajit at doses up to 2g/day for up to 90 days haven’t reported serious side effects.[1],[2],[3] The bigger safety factor is product quality — poorly purified shilajit can carry heavy metals, so daily use is really only as safe as the product you’re buying.
Clinical trials used 200–500mg/day for testosterone and fertility benefits, up to 2g/day in the cholesterol study. Most commercial products suggest 300–500mg/day as a reasonable starting dose.
Possibly — it may lower blood sugar and blood pressure, and people with phenylketonuria or high uric acid should avoid it. The most serious risk is heavy-metal exposure from poorly purified products, not a direct drug-like side effect from the resin itself.
No blanket ban exists, but Health Canada has issued advisories about heavy-metal contamination in certain Ayurvedic products, including some shilajit products. It’s a warning about specific unsafe products, not the herb itself.
Mixed, and it depends on the specific claim. Testosterone and male fertility have real human RCTs behind them. Cholesterol improvement has one small human study. Pain relief and brain-health claims are based on animal or lab research only, and several benefits you’ll see cited elsewhere online (hair growth, diabetes management, weight loss) don’t currently have credible human research behind them at all.
References
- Biswas TK, Pandit S, Mondal S, et al. Clinical evaluation of spermatogenic activity of processed Shilajit in oligospermia. Andrologia. 2010;42(1):48-56. https://pubmed.ncbi.nlm.nih.gov/20078516/
- Pandit S, Biswas S, Jana U, De RK, Mukhopadhyay SC, Biswas TK. Clinical evaluation of purified Shilajit on testosterone levels in healthy volunteers. Andrologia. 2016;48(5):570-575. https://pubmed.ncbi.nlm.nih.gov/26395129/
- Sharma P, Jha J, Shrinivas VP, Dwivedi LK, Suresh P, Sinha M. Shilajit: evaluation of its effects on blood chemistry of normal human subjects. Ancient Science of Life. 2003;23(2):114-119.
- Ghosal S, et al. Pharmacological studies on shilajit’s effects on pain response and morphine tolerance in mice. Indian Journal of Experimental Biology / Phytotherapy Research (animal studies).
- Gandy JJ, Snyman JR, Van Rensburg CEJ. Randomized, parallel-group, double-blind, controlled study to evaluate the efficacy and safety of carbohydrate-derived fulvic acid in topical treatment of eczema. Clinical, Cosmetic and Investigational Dermatology. 2011;4:145-148. https://pmc.ncbi.nlm.nih.gov/articles/PMC3173016/
- Cornejo A, Jiménez JM, Caballero L, Melo F, Maccioni RB. Fulvic acid inhibits aggregation and promotes disassembly of tau fibrils associated with Alzheimer’s disease. Journal of Alzheimer’s Disease. 2011 (in-vitro study).
