Shilajit Heavy Metals & FDA — What Buyers Need to Know in 2026

Shilajit forms through the geological compression of organic matter — mosses, lichens, microbial biomass — between layers of rock over millions of years at high altitude. The same mineralization process that yields concentrated fulvic acid and trace minerals also concentrates whatever else is present in the surrounding geology. In many mountain formations, this includes naturally occurring deposits of lead, mercury, arsenic, and cadmium — independent of any industrial activity.

Four metals are routinely screened in dietary supplement testing and are the ones that matter for shilajit safety evaluation:

MADL = Maximum Allowable Dose Level. Prop 65 thresholds are based on daily exposure, not product concentration. FDA limits are per-gram concentration limits for dietary supplements.

The FDA regulates shilajit as a dietary supplement under the Dietary Supplement Health and Education Act (DSHEA) of 1994. This has several specific implications for how heavy metals contamination is governed:

The practical implication of this regulatory structure: because the FDA does not test shilajit products before they reach market, the burden of verification falls entirely on the buyer. Independent third-party COAs are the only mechanism that substitutes for the pre-market approval process that dietary supplements do not receive.

California's Safe Drinking Water and Toxic Enforcement Act of 1986 — universally known as Proposition 65 — requires businesses to provide a specific warning before knowingly exposing Californians to substances on a list of chemicals known to cause cancer, birth defects, or other reproductive harm.

Lead is on the Prop 65 list. This is significant for shilajit buyers in California — and for anyone evaluating product safety — for several reasons:

For California residents specifically: a product without any Prop 65 warning and without a published COA is in a more ambiguous position than a product that either discloses the warning or publishes a COA showing lead below detectable thresholds.

Memorial Sloan Kettering Cancer Center maintains one of the most widely cited integrative medicine databases for herbs and supplements. Their entry on shilajit is regularly referenced in discussions of its safety, so it is worth addressing precisely rather than dismissively.

The honest reading of MSK's position: they are flagging exactly what this page is flagging — that untested or poorly characterized products carry a genuine heavy metals risk. A product with a published, independent, accredited COA showing metals within limits directly addresses the concern MSK raises. It does not address the separate questions of limited human clinical data or efficacy claims.

For a full breakdown of MSK's positions on shilajit — including efficacy and long-term safety — see the complete shilajit safety guide.

Inductively Coupled Plasma Mass Spectrometry (ICP-MS) is the analytical gold standard for trace metal analysis in dietary supplements and food products. It is the method referenced in FDA guidance and used by the most credible testing laboratories. Understanding how it works helps you evaluate whether a COA is trustworthy.

When evaluating a COA, look for the method stated as "ICP-MS" or "ICP/MS." Some brands use LC-MS (Liquid Chromatography-Mass Spectrometry) for organic compound analysis — this is complementary to ICP-MS for heavy metals, not a replacement. Natural Shilajit uses both ICP-MS and LC-MS, giving the most comprehensive analytical picture in our database.

A well-structured heavy metals COA panel contains specific information that distinguishes it from a meaningless marketing claim. Here is how to read one correctly — with the elements a legitimate document must include versus what red-flag documents typically show.

The most important single distinction: a PASS without a number is not a COA — it is a label.Anyone can write "heavy metals tested" on packaging. Only a document showing the actual measured value, the reference limit, and the laboratory identity constitutes evidence.

For a detailed walkthrough of every section of a shilajit COA — including fulvic acid percentage, microbial panels, and accreditation logos — see our how to read a shilajit COA guide. You can also see real COA examples for verified brands on our lab data page.

Four brands in our database have documented, third-party heavy metals testing with enough specificity to evaluate. Our rating methodology details how we assess COA quality. Here is the lab-level breakdown for each:

Our database tracks 74+ products. Among these, a significant number lack publicly accessible COAs with actual heavy metals values. We do not list specific brand names in a "brands to avoid" context without full review — but we can describe the pattern clearly:

For our complete methodology on how we evaluate and tier brands — including the specific criteria for COA verification — see the methodology page.

Shilajit and heavy metals is not a controversy — it is a geological fact. Shilajit concentrates minerals. Some of those minerals are hazardous at sufficient doses. Independent ICP-MS testing is the mechanism by which the risk is either confirmed safe or not.

The FDA does not pre-approve shilajit. California Prop 65's lead thresholds are stricter than the FDA's guidance and are more relevant to everyday exposure levels. Memorial Sloan Kettering's concern is accurately characterized: untested products are genuinely risky, and tested products address that concern directly.

The four brands in our database that meet this standard — Black Lotus (IAS Labs, Phoenix), Natural Shilajit (ISO-certified US labs, ICP-MS + LC-MS), Pure Himalayan (ISO/IEC 17025 accredited US lab), and Pürblack (US pharmaceutical-grade facility) — have done the verification work. Products without equivalent documentation have not.

For the heavy metals data specifically for each brand in our database, see the lab data page. For a deeper dive into the specific COA sections that cover safety, see our guide on shilajit heavy metals — what's safe and what's not.