Shilajit Research: What Scientists Have Studied (and What We Don't Know Yet)

What researchers have actually studied about shilajit, from exercise and hormone studies in healthy people to early lab and animal work, plus the honest limitations and how to choose a tested resin.

Shilajit has been part of Ayurvedic tradition for centuries, and in the last few decades it has also caught the attention of researchers. This page summarizes what scientists have studied so far, what kind of studies they were, and what we honestly don't know yet. It's meant to help you read the headlines critically, not to promise any result.

First, How to Read Shilajit Research

Not all studies carry the same weight. When you see a claim about shilajit, it helps to know which kind of study it came from:

• Lab (cell) studies test compounds on cells in a dish. They are useful for generating ideas, but they don't tell us what happens in a person.
• Animal studies are a step closer, but results often don't carry over to humans.
• Human trials, especially randomized, placebo-controlled ones, are the strongest evidence. For shilajit, these are still few, small and short.

Much of what you'll read about shilajit online blurs these lines. We'd rather be clear about them.

What's Actually in Shilajit

Shilajit is mostly organic matter, primarily humic substances including fulvic acid, along with naturally occurring minerals and trace elements. The exact makeup varies a lot by source and purification, which is one reason lab testing matters so much. Fulvic acid is the compound researchers focus on most, and it's the main quality marker on a certificate of analysis.

Areas Researchers Are Studying

1. Exercise and muscle fatigue (human study)

In a 2019 study in the Journal of the International Society of Sports Nutrition, 63 recreationally active men took shilajit (250 or 500 mg daily) or placebo for 8 weeks. The higher-dose group retained more muscle strength after a fatiguing exercise protocol. It's one small study in healthy young men, so it's a promising lead rather than a conclusion.*

2. Antioxidant activity (lab studies)

Fulvic acid shows strong antioxidant activity in laboratory tests, and some shilajit samples have scored highly on lab antioxidant measures. Lab antioxidant scores don't translate directly into effects in the body, but this is one reason shilajit is traditionally valued as a daily tonic.*

3. Memory and learning (lab and animal studies only)

Researchers have looked at shilajit and fulvic acid in cell models and in animals, including memory tasks in rats and zebrafish. These are early-stage studies. There are no large human trials in this area, so we don't make any claims about memory or brain health for people.

4. Hormone research in healthy men (human study)

A 2016 randomized, placebo-controlled study in Andrologia gave healthy men aged 45–55 purified shilajit (250 mg twice daily) for 90 days and measured hormone levels. The shilajit group showed higher total and free testosterone than placebo. It was a single small study, and hormone levels are influenced by many factors, so it shouldn't be read as a promise for any individual.

5. Blood lipid markers (small human study)

An older, small study in healthy adults reported changes in blood lipid markers after daily shilajit use. The study was small and hasn't been widely replicated, so it's best treated as a question for future research.

6. Traditional use as a daily tonic

In Ayurveda, shilajit is classed as a rasayana, a substance taken regularly to support overall vitality and healthy aging.* This is traditional use rather than clinical evidence, but it's the heart of why people have taken shilajit for generations.

The Honest Limitations

A 2024 systematic review of the clinical literature concluded that shilajit is a promising area of study but that higher-quality research is still needed. Most studies are small, short, use different shilajit preparations, or were done in labs and animals. That's why we describe shilajit as a traditional supplement with interesting early research, not as a treatment for anything.

Quality and Safety Matter More Than Any Study

Because shilajit comes from rock, raw or poorly purified resin can contain heavy metals such as lead, arsenic, cadmium and mercury. Whatever the research says, it only applies to clean, properly purified shilajit. Before you buy, look for:

• A certificate of analysis from an accredited third-party lab
• Passing heavy metal results
• A verified fulvic acid percentage

You can see our lab results on our Certificates of Analysis page.

Side Effects and Who Should Check With a Doctor

Reported side effects in studies have generally been mild, such as stomach upset or headache. Talk to your healthcare professional before using shilajit if you:

• Are pregnant or nursing
• Have a medical condition
• Take any medication
• Have a hormone-sensitive condition

The Bottom Line

Shilajit has a long traditional history and a small but growing body of research, with the strongest human data so far in exercise and in hormone levels among healthy men. The research is early, and much of it comes from labs and animals. Enjoy shilajit as part of a healthy routine, choose a tested product, and be skeptical of anyone who promises more than the science shows.

References

• Keller JL, et al. The effects of Shilajit supplementation on fatigue-induced decreases in muscular strength and serum hydroxyproline levels. J Int Soc Sports Nutr. 2019;16:3.
• Pandit S, et al. Clinical evaluation of purified Shilajit on testosterone levels in healthy volunteers. Andrologia. 2016;48(5):570–575.
• Carrasco-Gallardo C, Guzmán L, Maccioni RB. Shilajit: a natural phytocomplex with potential procognitive activity. 2012. PMC3296184.
• Jaiswal AK, Bhattacharya SK. Effects of shilajit on learning and memory in rats. Phytotherapy Research. 1993;7:29–34.
• Ali SM, et al. Systematic review of Shilajit: clinical efficacy and safety. 2024.
• Aadil N, et al. Heavy metals and humic substances in Shilajit. Biological Trace Element Research. 2024;202(12):5794–5814.
• Examine.com. Shilajit research breakdown. 2025.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for educational purposes and is not medical advice.