Shilajit: Benefits, Side Effects, Dosage and How to Take It

Shilajit is a dark, tar-like resin that oozes out of mountain rocks in the Himalayas, Altai Mountains, and other high-altitude ranges. It takes hundreds to thousands of years to form. It cannot be grown, farmed, or manufactured. Ancient Ayurvedic texts called it a rasayana, a substance meant to promote longevity, and named it "conqueror of mountains and destroyer of weakness" in Sanskrit.

Today, it is one of the fastest-growing supplements in the US, popular among biohackers, men looking to support testosterone naturally, and anyone interested in mineral-rich supplementation.

This article covers shilajit benefits, shilajit side effects, the right shilajit dosage, and how to take shilajit safely.

What Is Shilajit?

Shilajit is not a rock, a plant extract, or a synthetic compound. Scientists classify it as a paleobiogenic substance, meaning it formed from ancient biological matter compressed under geological pressure over centuries. Ancient forests once covered regions that are now the Himalayas. When those plants died, they became trapped between rock layers. Microbial activity, extreme temperature swings, and mountain pressure then transformed that organic matter into a mineral-dense resin.

It contains:

• Fulvic acid: The most important active compound. It carries minerals into cells and has antioxidant and anti-inflammatory properties.

• Over 80 trace minerals in ionic form: Easier for the body to absorb than standard mineral supplements.

• Humic acid, dibenzo-alpha-pyrones (DBPs), and other bioactive compounds.

One fact most people do not know: authentic shilajit is only harvested above 3,500 meters (about 11,500 feet). Below that altitude, agricultural runoff and pollution contaminate the resin. The extreme cold-to-heat cycling at those heights concentrates the exudate and shapes its mineral profile. 

Shilajit Benefits

Research on shilajit is still in early stages. However, several human trials and a 2024 systematic review published in the Journal of Population Therapeutics and Clinical Pharmacology confirm significant potential across four main areas: chronic fatigue, high-altitude sickness, cognitive decline, and male infertility.

1. Energy and Fatigue Reduction

A 2025 NIH-published pilot study gave 25 healthy men 500 mg per day of shilajit resin for 28 days. Results showed:

• Fatigue severity scores dropped by 32.4%

• Perceived exertion during exercise dropped by 23.6%

• Leg press strength improved by 12.9%

• VO2 max went up significantly

The mechanism involves fulvic acid supporting mitochondrial function,  how your cells produce energy. Unlike caffeine, shilajit does not cause a spike and crash. It works at the cellular level. 

2. Shilajit for Men and Testosterone

This is the benefit that put shilajit on the map in the US male wellness space. A randomized, double-blind, placebo-controlled study published in Andrologia tested purified shilajit in healthy men aged 45 to 55. After 90 days at 250 mg twice daily:

• Total testosterone increased by approximately 20%

• Free testosterone increased by approximately 19%

• DHEAS levels rose significantly compared to placebo

A second 90-day trial in 2024 using a standardized extract called MEET Shilajeet found similar increases in total and free testosterone, along with improved vitality scores. 

Important: Most testosterone trials were small and some were manufacturer-funded. Results are promising, not conclusive. Independent large-scale trials are still needed.

3. Male Fertility

A 90-day study in men with low sperm count (oligospermia) gave 200 mg of shilajit daily. Outcomes included:

• Sperm count up by 61.4%

• Sperm volume up by 37.6%

• Sperm motility improved by 12.4 to 17.4%

4. Brain and Cognitive Health

Fulvic acid in shilajit has shown the ability to inhibit amyloid-beta plaque accumulation in lab studies. Amyloid-beta buildup is a defining feature of Alzheimer's disease. A 2024 study published in Integrative Medicine confirmed neuroprotective effects against amyloid-beta-induced cytotoxicity. 

Human trials in this area are still limited, but the early science is worth watching.

5. Bone Health (Including Women)

A 2022 randomized, double-blind, placebo-controlled trial published in Phytomedicine tested shilajit extract in postmenopausal women with osteopenia (early bone density loss). The shilajit group showed dose-dependent preservation of bone mineral density and reduced markers of inflammation and oxidative stress. This is one of the strongest-designed studies in the shilajit literature.

Shilajit vs Other Popular Supplements

Shilajit Side Effects

Shilajit is generally well tolerated when taken at the correct dose from a clean, tested source. A 2024 systematic review covering trials of up to 12 months reported that adverse events were mostly mild and short-lived.

Common side effects:

• Nausea or stomach discomfort, especially on an empty stomach

• Mild headaches in the first few days

• Loose stools or abdominal cramps

The bigger risk in the US market is contamination, not the compound itself.

A 2024 ConsumerLab review found variability in heavy metal content among popular shilajit brands, including products labeled as purified. A 2025 study in BMC Chemistry specifically flagged thallium,  a toxic heavy metal that damages the kidneys and nervous system, in some shilajit samples above safe consumption thresholds. (BMC Chemistry 2025 study) The FDA does not pre-approve supplements, so quality depends entirely on the manufacturer.

Who Should Not Take Shilajit?

• Pregnant or breastfeeding women

• People with active kidney disease or gout

• Those on diabetes or blood pressure medications (possible interactions)

• Anyone with known heavy metal sensitivity or compromised liver function

Shilajit Dosage

Clinical trials have used daily doses ranging from 200 mg to 2,000 mg. The most commonly studied and recommended dose is 300 mg to 500 mg per day.

Start low. If you are new to shilajit, begin at 100 to 150 mg per day for the first week. Many regular users take a 1 to 2 week break every 6 to 8 weeks, though there is no clinical mandate for this. Consistency matters more than cycling.

How to Take Shilajit

Shilajit comes in three main forms: resin, powder, and capsules.

Resin (most potent): Scoop a pea-sized amount (300 to 500 mg) and dissolve in warm, not boiling water, milk, or tea. Hot water degrades active compounds. Stir until fully dissolved and drink in the morning with breakfast.

Powder: Mix into a smoothie or warm drink. Pairs well with a multivitamin because fulvic acid increases the bioavailability of minerals taken at the same time.

Capsules: The most convenient option, especially for travel. Take with 12 to 16 oz of warm water and a small amount of food. The 2016 testosterone trial used capsules at 250 mg twice daily with meals. (Andrologia trial)

Timing:

• Best: morning with breakfast

• Second dose (if splitting): early afternoon with lunch

• Avoid after 3 to 4 PM if you are sensitive to supplements that affect energy

Shilajit is not a stimulant, but some users report feeling more alert after taking it, which can interfere with winding down at night.

How to Find Pure Shilajit in the US

The US supplement market is not pre-screened by the FDA. Here is what to check before buying:

• Certificate of Analysis (COA) from an independent third-party lab showing results for lead, arsenic, mercury, cadmium, and thallium

• GMP certification: Make sure the facility follows FDA-regulated Good Manufacturing Practices

• Standardized extract:  Look for products standardized to at least 50% fulvic acid and a defined DBP content. PrimaVie is one benchmark extract used in multiple published trials

• Sourced above 3,500 meters:  Lower-altitude sources carry a higher contamination risk

• Avoid suspiciously cheap products: Authentic tested shilajit is not cheap to produce

If you see a California Prop 65 warning on a label, it is a state-level right-to-know disclosure, not a federal safety ban. It can appear for trace mineral levels that are far below FDA thresholds. Note it, but do not panic over it.

Conclusion

Shilajit is a legitimate, ancient substance with a growing body of modern research behind it. The evidence for energy support, testosterone, fertility, and bone health is real enough to take seriously, especially for men over 40 or anyone dealing with chronic fatigue.

The biggest risk is not the compound. It is what is in the product you buy. Stick to brands that publish independent COAs, use standardized extracts, and manufacture in GMP-certified facilities. Start low, take it with food, and give it at least 4 to 6 weeks before drawing conclusions.