Not All Shilajit Is the Same: What the Purity and Composition Research Shows

What is shilajit actually made of?

Shilajit forms over centuries as plant and microbial matter decomposes under pressure in high-altitude rock formations, then seeps out as a sticky, mineral-rich resin. A classic composition review by Agarwal and colleagues describes it as a complex mixture of humic substances along with plant and microbial metabolites, not a single isolated compound.

The organic fraction that research has focused on most includes a few named components:

• Fulvic acid, a small-molecule humic substance that research has tied most consistently to shilajit's mineral-binding and antioxidant activity
• Humic acid, a related but larger and less bioavailable compound, found in overlapping but distinct amounts
• Dibenzo-alpha-pyrones, a group of compounds also called urolithins, which later research has connected to antioxidant activity
• A wide mineral profile, since the resin forms embedded in mineral-rich rock over very long timescales
• Plant-derived phytochemicals, carried over from the organic matter that decomposed to form the resin in the first place

That list makes clear why two products both labeled shilajit can be meaningfully different substances depending on how much of each fraction survived collection and processing.

Why the ratio of these components is not fixed

• Source geology varies. Mineral content and contaminant exposure differ by mountain range, altitude, and specific rock formation.
• Collection method matters. Resin scraped directly from rock seepage carries far more inert mineral sediment than resin filtered and concentrated afterward.
• Processing determines what survives. Heat, filtration, and purification steps can raise or strip the proportion of fulvic acid, humic acid, and other organics relative to mineral ash.
• Testing standards are not universal. Not every supplier publishes a verified fulvic acid percentage, which means label claims are not always independently checked.

What did a real chemical analysis of raw shilajit find?

In 2025, researchers at AIIMS Rishikesh and IIT Roorkee ran a full chemical workup on 50 grams of raw shilajit, self-prepared and sourced from a monk in Uttarkashi, India, and published the results in ACS Omega. The findings are specific:

• Total ash made up 57.69% of the sample's dry weight, meaning mineral residue, not organic compound, was the single largest component by far
• Acid-insoluble ash was 33.3%, pointing to rock and sediment that did not dissolve even under acidic conditions
• Potassium and calcium dominated the mineral content, consistent with other published shilajit elemental analyses
• The sample's own GC-MS chemical screen, a method that separates and identifies individual compounds, found 37 identifiable compounds, none of which were fulvic acid or dibenzo-alpha-pyrones, even though the paper's own abstract mentioned those compounds as having been identified

That last point matters more than it might first appear. The study's methods and data table tell a more conservative story than its own summary suggests, which is exactly the kind of gap a careful reader, or a careful supplier, has to catch rather than take on faith.

What this one analysis does and does not prove

• It is a single raw sample from a single source, not a survey of the shilajit market broadly
• It has no bearing on any specific commercial product, since it was self-prepared by an individual rather than commercially processed or purified
• It is not a safety or efficacy test of any kind. It is a compositional snapshot of what unprocessed resin can contain.
• It does demonstrate, concretely, that raw shilajit is not automatically a concentrated source of fulvic acid, which is the assumption much of the raw-resin market relies on

Why does fulvic acid content matter so much?

Fulvic acid is the component most research attention has focused on, for a specific reason: it is the compound most reliably measured and most consistently connected to shilajit's documented biological activity in human studies. A 2014 review by Stohs summarizing shilajit's antioxidant, anti-inflammatory, and adaptogenic research across human and animal studies repeatedly ties those effects back to the fulvic acid fraction specifically.

That is also why fulvic acid percentage has become the most common quality marker suppliers can point to. A product can state a specific, lab-verified fulvic acid percentage, the kind that can be checked against a third-party certificate of analysis, where other composition claims are harder to independently confirm.

How does purification change what you are actually getting?

Purification is not a marketing step. It is a filtration and concentration process that changes the actual ratio of components in the final product. A resin that starts as mostly mineral ash, sediment, and organic matter in unknown proportions can be filtered to concentrate the fulvic acid and other organics while removing inert material and testing for contaminants.

That distinction showed up directly in the human research discussed above. A 2019 placebo-controlled human trial on shilajit and skin collagen genes, led by Das and colleagues, used a standardized, purified resin with a confirmed composition, not raw material of unknown fulvic acid content. That is not an incidental detail. It is the reason the trial's findings can be attributed to a known substance rather than an unverifiable one.

What should you look for in a shilajit product?

A short, evidence-grounded checklist:

1. A stated fulvic acid percentage, confirmed by third-party lab testing rather than listed without verification
2. Heavy metal testing results, published and available, since mineral-rich resin can concentrate contaminants from its source rock
3. Mold and mycotoxin testing, for the same reason, since organic resin stored or processed improperly can develop contamination raw sourcing alone cannot guarantee against
4. A named source region, since composition research consistently ties mineral and organic content back to specific geology
5. A manufacturer willing to publish its certificate of analysis, rather than asking a buyer to take a label claim on faith

See Optimum Shilajit

Optimum Shilajit is sourced from the Altai mountains and standardized to a verified fulvic acid percentage, confirmed by an outside lab, with results for heavy metals and mold toxins posted publicly. See Optimum Shilajit.

See See Optimum Shilajit