What Shilajit Is and How It Works

Shilajit is a tar-like substance that seeps from rock faces in the Himalayas and other high mountain ranges. It forms over centuries as plant matter and microbial material compress and oxidize in the earth. The substance contains minerals (zinc, iron, magnesium, potassium), fulvic acid, and dozens of other organic compounds.

When you consume shilajit, fulvic acid is thought to be the active ingredient. The theory is that fulvic acid helps your cells absorb minerals more efficiently and may reduce inflammation at the cellular level. It also acts as an antioxidant, meaning it can neutralize unstable molecules called free radicals that damage cells. However, most of this mechanism comes from laboratory and animal studies—direct evidence in humans is limited.

Shilajit has been used in Ayurvedic medicine for thousands of years, but traditional use does not tell us whether it works or how much you need. Modern research is still catching up to the claims.

Key Takeaways

  • Shilajit contains fulvic acid and minerals, and laboratory studies suggest it may improve how cells absorb nutrients and reduce inflammation, but human trials remain small and limited.
  • The strongest evidence so far is for energy and fatigue in people with low mitochondrial function, though the studies involved fewer than 100 people each.
  • Shilajit may interact with blood thinners and medications that affect iron or copper levels, so check with a doctor before using it if you take prescription drugs.
  • Quality varies widely because shilajit is not heavily regulated; look for products tested by third parties for heavy metals and purity.
  • Most human studies have lasted weeks to a few months, so long-term safety and benefit remain unknown.

Energy and Mitochondrial Function

The most studied claim about shilajit is that it boosts energy by improving how your mitochondria—the power plants of your cells—work. A 2012 trial published in the Journal of the International Society of Sports Nutrition gave 60 men either shilajit or a placebo for 8 weeks. The shilajit group reported less fatigue and better recovery after exercise, though the difference was modest.

A smaller 2016 study in Andrologia found that men taking shilajit had higher ATP levels (ATP is the molecule cells use to store and release energy) compared to placebo. However, this study involved only 35 people and lasted 12 weeks. The effect size was real but not dramatic—think of it as a 10 to 15 percent improvement, not a transformation.

These results matter most for people with chronic fatigue or conditions that damage mitochondria. For healthy people, the boost is noticeable but not life-changing. The evidence is stronger than for many supplements, but it is still based on small, short-term trials.

Mineral Absorption and Nutrient Delivery

Fulvic acid in shilajit is claimed to act as a carrier, helping your gut absorb minerals like zinc, iron, and magnesium more efficiently. In test-tube and animal studies, fulvic acid does bind to minerals and appears to help cells take them up. But human studies on this mechanism are almost nonexistent.

One 2015 study in Nutrition & Metabolism gave 60 people shilajit or placebo for 24 weeks and measured blood levels of various minerals. The shilajit group showed higher zinc and copper levels, but the study did not track whether this translated to better health outcomes—just that the levels changed. It is unclear whether this matters clinically or whether the effect persists long-term.

If you already eat enough minerals, shilajit is unlikely to move the needle. If you have a documented deficiency, it might help, but a doctor would normally recommend a targeted supplement (like iron or zinc alone) with a known dose rather than shilajit, which varies in composition.

Antioxidant and Anti-Inflammatory Effects

Laboratory research shows that fulvic acid and other compounds in shilajit neutralize free radicals and reduce markers of inflammation in cells and tissues. A 2013 animal study in Phytotherapy Research found that shilajit reduced inflammatory markers in rats with arthritis. A 2017 human study in Journal of Medicinal Food gave 30 people with joint pain either shilajit or placebo for 8 weeks; the shilajit group reported less pain and stiffness.

These results are encouraging but come with caveats. The human study was small, lasted only 8 weeks, and relied on self-reported pain rather than objective measures like imaging or blood markers. We do not know if the effect continues beyond 8 weeks or whether it is stronger than standard anti-inflammatory treatments like NSAIDs or physical therapy.

Chronic inflammation is linked to heart disease, diabetes, and cancer, so if shilajit truly reduces it, that would be significant. But the evidence is still preliminary—we would need larger, longer trials to know whether it prevents disease or just reduces symptoms.

Sexual Function and Testosterone

Several studies have examined shilajit's effect on male sexual function and testosterone levels. A 2010 trial in Andrologia gave 60 men with low testosterone either shilajit or placebo for 90 days. The shilajit group showed a 23 percent increase in testosterone and improved sexual function compared to placebo. A 2016 study in the same journal found similar results in 35 men over 12 weeks.

These findings are real, but the studies are small and the testosterone increases are modest—23 percent is meaningful but not dramatic. The mechanism is unclear: shilajit might improve mitochondrial function in the testes, or it might straightforward provide minerals needed for hormone production. We do not know if the effect continues beyond the study period or whether it works in men with normal testosterone levels.

For men with documented low testosterone, shilajit might be worth discussing with a doctor, but it is not a substitute for medical treatment. For men with normal testosterone, the evidence does not support using it as a performance enhancer.

Safety, Interactions, and Quality Concerns

Shilajit is generally well-tolerated in the doses studied (300 to 500 mg per day), with few reported side effects beyond mild digestive upset. However, it can interact with medications. Because shilajit contains iron and copper, it may interfere with blood thinners like warfarin or with medications that affect iron metabolism. If you take prescription drugs, ask your doctor before starting shilajit.

A major concern is quality and purity. Shilajit is not regulated by the FDA, and products vary widely in composition and contamination. Some samples have tested positive for heavy metals like lead and mercury, which accumulate in the body and cause harm over time. Look for products that have been tested by a third party (such as NSF International or USP) for heavy metals, microbial contamination, and label accuracy.

Pregnant and breastfeeding people should avoid shilajit because safety data in these populations does not exist. People with gout or high uric acid levels should be cautious, as shilajit may raise uric acid levels slightly.

How Shilajit Compares to Other Mineral Supplements

If your goal is to absorb minerals better, a targeted supplement (zinc, iron, or magnesium alone) with a known dose is more predictable than shilajit. If your goal is energy, creatine monohydrate and coenzyme Q10 have stronger evidence in humans. If your goal is to reduce inflammation, omega-3 fatty acids and curcumin have more robust trial data.

Shilajit's advantage is that it contains multiple compounds in one product, which appeals to people who want a whole-food approach. Its disadvantage is that you do not know exactly what you are getting, the dose of active ingredients varies between products, and the human evidence is thinner than for single-ingredient supplements with longer research histories.

The choice depends on your priorities: if you value traditional use and are willing to accept more uncertainty, shilajit is reasonable. If you want maximum certainty and strong human evidence, other supplements are better-studied.

Frequently Asked Questions

Does shilajit really increase testosterone?

Small studies show modest increases in testosterone in men with low levels, but the effect is not dramatic and may not persist long-term. For men with normal testosterone, there is no evidence it boosts levels further. If you suspect low testosterone, a blood test from your doctor is the first step, not shilajit.

Is shilajit safe to take every day?

The studies that showed benefit used daily doses of 300 to 500 mg for weeks to months without serious side effects. Long-term safety beyond a few months is unknown. If you have kidney disease, take blood thinners, or have gout, talk to a doctor first.

Can shilajit replace my multivitamin?

No. Shilajit contains some minerals but not in reliable amounts, and it does not contain vitamins. If you need a multivitamin, take one with a label listing exact doses. Shilajit could be an add-on, but not a replacement.

How do I know if a shilajit product is pure?

Look for products tested by a third party like NSF International or USP for heavy metals and microbial contamination. Check the label for the fulvic acid content (usually listed as a percentage). Avoid products with vague ingredient lists or no testing information.

Will shilajit help my fatigue?

If your fatigue is due to low energy production in your cells (mitochondrial dysfunction), shilajit may help modestly. If your fatigue is from sleep deprivation, depression, or an untreated medical condition, shilajit is unlikely to fix it. See a doctor to rule out treatable causes first.