Himalayan shilajit is a thick, tar-like substance that seeps from cracks in high-altitude rocks, primarily in the Himalayan mountain range. It forms over centuries as microorganisms slowly break down ancient plant material, compressing it into a mineral-rich resin that has been used in Ayurvedic medicine for thousands of years. Its key active component is fulvic acid, a compound that helps the body absorb minerals by binding to them and carrying them across cell membranes.
How Shilajit Forms
Shilajit isn’t mined or manufactured. It’s the end product of a geological and biological process that takes centuries. Specific plant species decompose under pressure between layers of rock, aided by microbial activity. Over time, this creates a dark, sticky substance rich in organic acids and trace minerals that eventually oozes from rock faces at elevations typically between 1,000 and 5,000 meters. The result is classified as a “phytocomplex,” meaning it’s a naturally occurring blend of plant-derived compounds rather than a single isolated chemical.
The primary organic compounds in shilajit are humic substances, the same family of molecules found in rich soil and compost but in a far more concentrated form. Fulvic acid, the most studied of these, acts as a natural chelator. It binds to minerals and makes them easier for your cells to take up, which likely explains why traditional practitioners paired shilajit with other herbal remedies to boost their effects.
What It Contains
Shilajit’s composition varies depending on where it’s collected, but all authentic samples share a core profile: a high concentration of fulvic acid, over 85 trace minerals, and a range of organic acids. The fulvic acid content is considered the main marker of quality and is what distinguishes shilajit from ordinary humic soil extracts. Beyond minerals like iron, zinc, and magnesium, shilajit contains small amounts of amino acids and plant-based antioxidants that survived the centuries-long decomposition process.
Effects on Testosterone
One of the most-cited human studies on shilajit looked at its effect on testosterone in men aged 45 to 55. Participants took 250 mg of purified shilajit twice daily (500 mg total) for 90 consecutive days. Compared to placebo, the shilajit group showed significant increases in total testosterone, free testosterone, and DHEA, a precursor hormone the body uses to produce both testosterone and estrogen. The study was randomized and placebo-controlled, which makes the results more reliable than animal research alone, though larger trials are still needed to confirm the magnitude of the effect.
Energy and Mitochondrial Function
Shilajit appears to support energy production at the cellular level by protecting mitochondria, the structures inside your cells that generate usable energy. In animal models of chronic fatigue, shilajit stabilized the enzyme systems mitochondria depend on and reduced oxidative stress that damages those structures over time. It also helped regulate the stress hormone axis (the communication loop between your brain and adrenal glands), which plays a major role in fatigue and burnout. These findings suggest shilajit may help with sustained energy rather than providing a stimulant-like boost, though human trials specifically on fatigue are limited.
Resin, Powder, or Capsule
Shilajit comes in three main forms, and the differences matter more than you might expect.
Resin is the closest to shilajit’s natural state after purification. It’s a sticky, dark paste that dissolves in warm water or milk. Because it undergoes minimal processing, resin typically retains the highest concentration of fulvic acid and the broadest mineral profile. This is the form most traditional practitioners use and the one most clinical studies are based on.
Powder is made by drying purified resin and grinding it. The extra processing can reduce fulvic acid concentration and alter the mineral complexity. It’s more convenient to measure but potentially less potent gram for gram.
Capsules usually contain shilajit extract powder with the addition of binders or fillers needed for the capsule manufacturing process. They’re the easiest to take but tend to have the lowest mineral concentration of the three forms. If you go with capsules, check whether the label specifies fulvic acid content.
Dosage
Clinical trials have used doses ranging from 200 to 2,000 mg per day, but the most common protocol is 500 mg daily split into two doses, typically taken with meals. This is the dose used in the testosterone study and several other human trials. Optimal dosing for specific health goals hasn’t been firmly established yet, so starting at the lower end and adjusting is a reasonable approach. If you’re using resin, 500 mg is roughly a pea-sized portion.
Who Should Avoid It
Shilajit is generally well tolerated in healthy adults, but it carries real risks for certain groups. Because it’s mineral-dense and may raise iron levels, people with hemochromatosis (iron overload), high ferritin, or chronic liver disease should avoid it. Its potential to increase testosterone makes it a concern for anyone with prostate cancer, hormone-sensitive cancers, or severe prostate enlargement.
If you take insulin or diabetes medications, shilajit can amplify their blood-sugar-lowering effect and push glucose dangerously low. People with kidney disease, gout (shilajit may raise uric acid), active heart disease, or autoimmune disorders should also use caution or avoid it entirely. No reliable safety data exists for pregnant or breastfeeding women.
Purity and Contamination Risks
Raw shilajit collected directly from rocks can contain heavy metals, free radicals, and fungal contaminants. Purification is not optional. Reputable suppliers process the raw material to remove these contaminants while preserving the fulvic acid and mineral content. Products that skip this step, or that are sold as “raw” without third-party testing, pose a genuine health risk. When evaluating a product, look for independent lab testing that confirms fulvic acid percentage, heavy metal levels (especially lead, arsenic, and mercury), and the absence of microbial contamination.