Heavy Metal Limits in Shilajit: EU, UK, USA & WHO Standards Explained

There is no single worldwide heavy-metal limit that applies to every Shilajit product. The EU and UK set legally binding product-concentration limits (mg/kg) for some metals in food supplements. California Prop 65 and USP use daily-exposure values (μg/day) — a different measurement basis entirely. WHO values are science-based exposure guidance, not legally enforceable product limits. This guide explains each framework, how they differ, and how to read a laboratory result correctly.

Why Heavy Metals Are Tested in Shilajit

Shilajit forms over millions of years as organic matter decomposes under mountain rock. The same geological process that concentrates fulvic acid and trace minerals can also concentrate naturally occurring heavy metals — particularly lead, cadmium, mercury, and arsenic — from the surrounding rock strata.

This does not mean all Shilajit is contaminated. It means that raw, unprocessed Shilajit collected from rock faces requires rigorous purification and independent laboratory testing before it is suitable for consumption. The concentration of heavy metals in the final product depends on the collection site, purification method, and quality controls applied by the manufacturer.

For a detailed explanation of how heavy metals enter Shilajit and what risks they pose, see: Heavy Metals in Shilajit: What Every Buyer Must Know.

EU Heavy Metal Limits for Food Supplements

The European Union regulates contaminants in food — including food supplements — primarily through Commission Regulation (EC) No 1881/2006 and its subsequent amendments. Maximum levels are set for specific contaminants in specific food categories.

For food supplements, the following maximum levels are applicable under EU regulation where the relevant category applies:

• Lead: 3.0 mg/kg
• Cadmium: 1.0 mg/kg
• Mercury: 0.10 mg/kg

mg/kg explained: Milligrams per kilogram (mg/kg) is equivalent to parts per million (ppm). A limit of 3.0 mg/kg means no more than 3 milligrams of the contaminant per kilogram of product. This is a product-concentration limit — it applies to the finished product as measured in the laboratory, not to a daily intake calculation.

Source: Commission Regulation (EC) No 1881/2006 and amendments, EUR-Lex.

UK Heavy Metal Limits for Food Supplements

Following the UK’s departure from the EU, the UK retained EU food safety regulations into domestic law through the European Union (Withdrawal) Act 2018. As of the time of writing, the applicable maximum levels for food supplements in Great Britain broadly align with the EU framework:

• Lead: 3 mg/kg
• Cadmium: 1 mg/kg
• Mercury: 0.1 mg/kg

Source: UK Food Standards Agency; UK retained food contaminants regulation.

What About the United States?

The United States does not have a single federal numerical heavy-metal limit that applies universally to all dietary supplements in the same way the EU framework does.

Dietary supplements in the USA are regulated under the Dietary Supplement Health and Education Act (DSHEA) of 1994. Under DSHEA, manufacturers are responsible for ensuring their products are safe before marketing. The FDA does not pre-approve dietary supplements and does not publish a single universal heavy-metal limit table for all supplement categories.

The FDA can take action against products found to contain unsafe levels of contaminants, but the specific threshold applied depends on the contaminant, the product, and the exposure assessment. The FDA has issued guidance documents on specific contaminants — for example, action levels for lead in certain food categories — but these are not always directly applicable to all supplement formats.

California Proposition 65 (separate from federal FDA requirements) sets its own maximum allowable dose levels (MADLs) for reproductive toxicants and no significant risk levels (NSRLs) for carcinogens. For lead, the Prop 65 MADL is 0.5 micrograms per day. This is a daily exposure threshold, not a product-concentration limit, and applies specifically to products sold in California. It cannot be directly compared to the EU’s 3.0 mg/kg figure without converting between units and accounting for serving size.

USP (United States Pharmacopeia) publishes voluntary standards for dietary supplements, including heavy-metal limits. USP <232> and <233> set elemental impurity limits as permitted daily exposure (PDE) values — again expressed as μg/day, not mg/kg. These are voluntary pharmacopeial standards, not mandatory federal regulations.

Buyers in the USA should look for products that have been independently tested and where the laboratory report identifies the specific result, method, and detection limit — rather than relying on a single “passes US standards” claim.

Source: FDA.gov; DSHEA 1994; California OEHHA Prop 65 database.

Does WHO Set a Universal Shilajit Limit?

The World Health Organization (WHO) publishes guidance on contaminants in food and drinking water, including provisional tolerable weekly intakes (PTWIs) and provisional tolerable monthly intakes (PTMIs) for heavy metals. These are body-weight-based exposure guidance values — not product-specific concentration limits, and not legally binding in any jurisdiction.

It is important to distinguish between:

• WHO guidance: Science-based exposure recommendations used to inform national regulation. Not legally binding. Expressed as μg per kg of body weight per week or month.
• National regulation: Legally enforceable limits set by individual countries or trading blocs (e.g., EU, UK). Expressed as mg/kg product concentration.
• Pharmacopeial standards: Voluntary quality standards published by bodies such as USP or European Pharmacopoeia. Expressed as μg/day permitted daily exposure.
• Manufacturer specifications: Internal limits set by individual brands, which may be stricter or looser than regulatory requirements.

Source: WHO Food Safety publications; JECFA evaluations.

Lead, Cadmium, Mercury and Arsenic Explained

Lead

Lead is a cumulative neurotoxin with no known safe level of exposure. It accumulates in bone and soft tissue over time. In supplements, lead contamination typically originates from the raw material’s geological environment. EU and UK frameworks set a maximum of 3 mg/kg for food supplements. California Prop 65 sets a daily exposure threshold of 0.5 micrograms — a different unit and measurement basis.

Cadmium

Cadmium accumulates primarily in the kidneys and has a long biological half-life. It is classified as a human carcinogen. EU and UK frameworks set a maximum of 1 mg/kg for food supplements. Cadmium is naturally present in soils and can be absorbed by plants; in Shilajit, it originates from the surrounding rock geology.

Mercury

Mercury exists in several forms — elemental, inorganic, and organic (methylmercury). Methylmercury is the most toxic form and is primarily a concern in fish and seafood. In mineral-based supplements such as Shilajit, inorganic mercury is the more relevant form. EU and UK frameworks set a maximum of 0.10 mg/kg for food supplements.

Arsenic

Arsenic exists as total arsenic and inorganic arsenic. Inorganic arsenic is the form of primary toxicological concern — it is classified as a Group 1 human carcinogen by the International Agency for Research on Cancer (IARC). Organic arsenic compounds, found in seafood, are generally considered less toxic. When reviewing a Shilajit COA for arsenic, note whether the result reports total arsenic or inorganic arsenic specifically, as these are different measurements with different risk implications. The EU does not set a single general arsenic limit for all food supplements; this is a deliberate regulatory distinction reflecting how arsenic limits are applied category-by-category.

How to Read Heavy Metals on a Shilajit COA

A Certificate of Analysis (COA) for heavy metals should contain the following information for each analyte tested. For a full guide to reading a Shilajit COA, see: How to Read a Shilajit Certificate of Analysis.

• Analyte: The specific element tested (e.g., Lead, Cadmium, Mercury, Arsenic).
• Units: The unit of measurement (e.g., mg/kg, μg/g, ppm). These are equivalent: 1 mg/kg = 1 μg/g = 1 ppm.
• Result: The measured value, or a reporting notation (see below).
• Detection / Reporting Limit: The lowest concentration the method can reliably detect or quantify.
• Test Method: The analytical method used (e.g., ICP-MS, ICP-OES, AAS).
• Laboratory: The name and accreditation of the testing laboratory.
• Batch Number: The specific production batch the sample was taken from.
• Report Date: When the analysis was completed and reported.
• Applicable Standard: The regulatory or pharmacopeial standard the result is compared against, if stated.

Understanding reporting notations:

• <0.01 mg/kg: The result was below 0.01 mg/kg — the instrument detected a signal below the reporting threshold. This does not mean zero; it means the concentration was too low to quantify precisely with the method used.
• <LOQ: Below the Limit of Quantification. The analyte may be present but cannot be accurately measured at this concentration with the method used.
• Not detected (ND): No signal was detected above the instrument’s detection limit. This does not mean the analyte is definitively absent at all concentrations — it means it was not detected at the sensitivity of the method used.

For more on how Eurofins conducts heavy metal testing, see: How Eurofins Tests Shilajit.

EU vs UK vs USA vs WHO — Framework Comparison

Sources: EUR-Lex (Reg. EC 1881/2006); UK FSA. Values current at time of writing. Subject to regulatory amendment.

Sources: California OEHHA Prop 65 database; USP <232>. Values current at time of writing.

Sources: WHO/JECFA. Values current at time of writing. WHO guidance values are periodically reviewed and updated.

Golden Shilajit Heavy Metal Testing

Golden Shilajit Official submits each batch for independent third-party laboratory testing. Heavy metal analysis is conducted by Eurofins Scientific. Microbiological testing is conducted separately by Bureau Veritas.

• Eurofins Scientific: Fulvic acid content and heavy metals (Lead, Arsenic, Cadmium, Mercury)
• Bureau Veritas: Microbiological safety testing

Batch-specific laboratory reports are available to review before purchase: Lab Reports & Certificate of Analysis.

For a step-by-step explanation of how each batch moves from production to independent laboratory analysis: Our Testing Process →

For more on why independent testing matters, see: Why Lab Tested Shilajit Matters.

Why “Pass” Alone Is Not Enough

A COA that states only “PASS” or “Compliant” without showing the actual numerical result is not a useful document. A meaningful heavy-metal COA should clearly identify:

• The actual measured result for each analyte
• The units of measurement
• The analytical method used
• The name and accreditation of the testing laboratory
• The batch number the sample was taken from
• The date the report was issued
• The standard or limit the result is compared against, if applicable

Without this information, it is not possible to verify what was tested, how it was tested, or whether the result is meaningful for the regulatory market in which the product is sold. For a full guide to identifying misleading COAs, see: Why Most Shilajit COAs Are Misleading.

Bottom Line

A laboratory result for heavy metals only makes sense when compared against the correct product category, measurement basis, and regulatory framework for the market in which the product is sold. EU and UK frameworks provide specific numerical product-concentration limits for food supplements. The USA operates under a different regulatory model with no single universal limit table — Prop 65 and USP use daily-exposure values that cannot be directly compared to EU mg/kg figures. WHO guidance is body-weight-based and not legally binding in any jurisdiction.

When evaluating a Shilajit product, look for a COA that shows the actual numerical result, the method, the laboratory, and the batch number — not just a pass/fail statement.

Frequently Asked Questions