Shilajit is a sticky, tar-like resin that seeps out of rock in high mountain ranges such as the Himalaya, the Altai and the Caucasus. It forms very slowly, over centuries, as plant and microbial matter trapped in the rock breaks down. Fulvic acid is one of its main components: a type of humic substance, an organic acid produced when plant material decomposes, and it is largely responsible for shilajit's dark colour. Shilajit has a long history in Ayurvedic tradition, but honest science tells a more careful story: human evidence is still limited, no EU health claim is authorised for it, and the single most important quality issue is that raw shilajit can carry heavy metals. That is why purification and independent lab-testing matter more than any number on a label.
What is shilajit, exactly?
Shilajit is a natural exudate. In simple terms, it is a substance that oozes out of cracks in rock, usually in warm weather, and then dries into a resin. Reviews of the ingredient describe it as a pale-brown to blackish-brown mass collected from steep rock faces in mountainous regions of the Indian subcontinent, Central Asia and beyond (Agarwal 2007). It is known by many regional names, including mumijo, mumie and moomiyo, which is why you will sometimes see those words used interchangeably.
It is not a plant, a mineral or a single molecule. It is a complex mixture. The main organic fraction is made up of humic substances, especially fulvic acid, together with a group of compounds called dibenzo-alpha-pyrones and a range of trace minerals bound within that organic material (Stohs 2014). Because it is a natural mixture rather than a manufactured compound, its exact make-up varies from source to source, which is one reason quality control is so important.
What is fulvic acid?
Fulvic acid belongs to a family called humic substances. These are the dark, complex organic acids that form when plant and animal matter decomposes in soil, water and rock (Gvozdeva 2025). Humic substances are usually split into three groups by how they dissolve: humin, humic acid and fulvic acid. Fulvic acid is the fraction that stays dissolved across a wide range of acidity, which makes it the most mobile and the most studied for use in water and supplements (Murbach 2020).
In the context of shilajit, fulvic acid matters for two reasons. First, it is a large part of what shilajit actually is. Second, its molecular structure lets it bind, or chelate, metal ions, which is why it is often described as carrying the minerals found in shilajit. That binding property is genuinely interesting, but it also cuts both ways, because the same chemistry that binds useful minerals can bind toxic ones. We will come back to that.
How shilajit forms
The leading explanation is slow biological decomposition. Over very long periods, layers of plant material and microbes become compressed inside rock at altitude. Under pressure, temperature swings and the action of microorganisms, this organic matter is gradually transformed into the humic-rich resin we call shilajit, which then seeps to the surface (Meena 2010). Authoritative summaries describe it plainly as a material that seeps from sedimentary rock, formed over centuries from the slow breakdown of plant and, in some accounts, animal matter (OPSS, U.S. Department of Defense).
Because this process depends on specific geology and climate, genuine shilajit is tied to particular mountain regions. That scarcity is part of its traditional prestige, and unfortunately it is also part of why adulteration and mislabelling are common in the wider market.
From mountain rock to a jar of resin
Raw shilajit scraped from rock is not ready to use. It contains rock fragments, sand, plant debris and, potentially, contaminants. Traditional and modern processing both aim to purify it: the raw material is typically dissolved in water, filtered to remove insoluble debris, and then concentrated back into a resin. Good manufacturers go further and test the finished resin in an independent laboratory.
This is the step that separates a trustworthy product from a risky one, and it is far more meaningful than any exotic origin story. A resin that has been purified and lab-tested for identity and contaminants is a different proposition from raw material sold with a colourful label. If you want the wider principle behind this, we cover it in our guide on why form and quality matter more than the dose.
Shilajit in traditional medicine
Shilajit has been used for centuries in Ayurvedic and Central Asian traditions, where it is classified as a rasayana, a category of tonics believed to support vitality (Wilson 2011). It is important to read that history for what it is: a long record of traditional use, not a body of modern proof. Traditional use can point researchers toward interesting questions, but it does not, on its own, establish that a substance works or is safe by today's standards.
We think the honest way to talk about shilajit is exactly this way. It is a traditional ingredient with a rich history and an interesting chemistry, sold as a food supplement, and it should be described without borrowing the language of medicine.
What does the science actually say?
Here is the careful part. Most of the published research on shilajit is preliminary. Reviews note that a good deal of the evidence comes from laboratory and animal studies, alongside a smaller number of human studies, several of which are small or industry-funded (OPSS, U.S. Department of Defense). Narrative reviews have explored possible roles for shilajit and its fulvic acid content, but they consistently call for larger and better-controlled human trials before firm conclusions can be drawn (Carrasco-Gallardo 2012).
In the European Union, this matters in a concrete way: there is no authorised health claim for shilajit or for fulvic acid. That means a supplement sold in the EU cannot legally claim that shilajit treats, prevents or improves any specific function of the body. So when you see confident health promises attached to shilajit, treat them as marketing, not established fact. A separate popular claim, that shilajit raises testosterone, is a good example of a story that has run far ahead of the evidence, which we look at in our myth-bust on shilajit and testosterone.
The heavy metal question
If there is one thing to take away from this article, it is this. The same humic chemistry that makes shilajit interesting also makes contamination a real concern. A 2024 review catalogued a wide range of metals reported in shilajit samples, including toxic ones such as lead, arsenic, cadmium and mercury, and discussed how humic substances can both bind and, in some conditions, release them (Hussain 2024). Authoritative safety resources make the same point: shilajit can contain heavy metals, and quality varies widely between products (OPSS, U.S. Department of Defense).
This is not a reason to fear shilajit. It is a reason to be selective. Purification removes debris and reduces contaminants, and independent laboratory testing verifies that the finished resin is within safe limits for heavy metals. Toxicological evaluations of purified fulvic and humic acid preparations exist precisely because regulators expect this kind of safety work to be done properly (Murbach 2020). A shilajit worth taking is one whose maker can show it has been tested. A shilajit sold on romance alone is one to walk past.
Resin, powder or capsule: how to choose
Shilajit is sold as a solid resin, as a dried powder and in capsules. None of these formats is automatically better, but the resin is the least processed and the easiest to inspect. Whatever the format, the questions that actually protect you are the same:
- Is it a single ingredient, or is it bulked out with fillers and flow agents?
- Has the finished product been tested by an independent laboratory, including for heavy metals?
- Is the source and the amount per serving stated clearly and honestly?
- Does the seller avoid medical claims that no EU supplement is allowed to make?
Our own purified shilajit resin is built around those answers: one natural ingredient, 600 mg per serving, no additives, and independently lab-tested. We deliberately do not print a fulvic acid percentage on it, because those figures are easy to inflate and hard to verify, and we would rather stand on testing than on a number.
How to take shilajit
For our shilajit resin, the recommended intake is 600 mg once a day, and you should not exceed 600 mg per day. Resin is usually dissolved in warm water or another drink until it disperses, which is why shilajit turns liquid a rich amber colour.
As a food supplement, shilajit is not a substitute for a varied, balanced diet and a healthy lifestyle. Keep it out of reach of young children. It is not recommended for pregnant or breastfeeding women. Consult a physician before use if you have a medical condition, take medication, or have an iron-metabolism or kidney disorder, because shilajit contributes minerals, including iron, that some people need to limit. If in doubt, speak to a healthcare professional first.
Frequently Asked Questions
Is shilajit the same as fulvic acid?
No. Fulvic acid is one of the main components of shilajit, not the whole thing. Shilajit is a natural resin that contains fulvic acid and other humic substances, dibenzo-alpha-pyrones and trace minerals. You can buy fulvic acid on its own, but that is not the same product as whole shilajit resin.
Is shilajit safe?
Purified, independently lab-tested shilajit taken at the recommended amount is generally considered a food supplement. The real safety issue is contamination: raw or poorly processed shilajit can contain heavy metals such as lead and arsenic. Choose a product that has been purified and tested, do not exceed the stated dose, and follow the cautions for pregnancy, breastfeeding, and iron or kidney conditions.
Does shilajit really do everything people claim?
Most claims run ahead of the evidence. Much of the research is laboratory or animal work, with only a limited number of small human studies. In the EU there is no authorised health claim for shilajit, so it should be described as a traditional ingredient rather than a treatment for anything.
Why is shilajit so dark?
Its colour comes from humic substances, especially fulvic and humic acids, which are naturally dark brown to black. When you dissolve genuine resin in warm water, it typically releases a golden to amber colour.
Resin or capsules: which is better?
Neither is automatically better. Resin is the least processed and easiest to inspect, while capsules are more convenient. The factors that matter most are the same for both: a single clean ingredient, a clearly stated amount, and independent lab-testing.
How much shilajit should I take?
Follow the label. For our resin the intake is 600 mg once a day and you should not exceed 600 mg daily. More is not better, and higher intakes only increase any contamination risk from a poorly tested product.
The Bottom Line
Shilajit is a resin that forms over centuries in high mountain rock, and fulvic acid is one of the humic substances that make it up and give it its colour. It is a genuinely interesting traditional ingredient, but the honest picture is modest: human evidence is limited, no EU health claim is authorised, and the biggest practical difference between a good product and a bad one is purification and independent lab-testing. Judge shilajit on how well it has been made and tested, not on the size of the promise attached to it.
Sources
- Agarwal SP, et al. Shilajit: a review. Phytotherapy Research. 2007.
- Meena H, et al. Shilajit: A panacea for high-altitude problems. International Journal of Ayurveda Research. 2010.
- Carrasco-Gallardo C, et al. Shilajit: A Natural Phytocomplex with Potential Procognitive Activity. International Journal of Alzheimer's Disease. 2012.
- Wilson E, et al. Review on shilajit used in traditional Indian medicine. Journal of Ethnopharmacology. 2011.
- Stohs SJ. Safety and efficacy of shilajit (mumie, moomiyo). Phytotherapy Research. 2014.
- Hussain A, et al. Hazardous or Advantageous: Uncovering the Roles of Heavy Metals and Humic Substances in Shilajit. Biological Trace Element Research. 2024.
- Murbach TS, et al. A toxicological evaluation of a fulvic and humic acids preparation. Toxicology Reports. 2020.
- Gvozdeva Y, et al. Biomedical Applications of Humic Substances: From Natural Biopolymers to Therapeutic Agents. Antioxidants. 2025.
- Operation Supplement Safety (OPSS), U.S. Department of Defense. Shilajit as a Dietary Supplement Ingredient.
