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Short answer
Enter the heavy metal figures from your shilajit certificate of analysis and the checker compares them with the GB limits for food supplements: 3.0 mg/kg lead, 1.0 mg/kg cadmium and 0.10 mg/kg mercury. Arsenic has no GB supplement limit, so it is shown against the range we found in UK lab reports.
Check your lab report
Type in the heavy metal results from your certificate. Leave a box empty if it isn't on the report. Nothing you enter leaves your browser.
What does the checker compare against?
Great Britain sets maximum levels for three heavy metals in food supplements, in Regulation (EC) 1881/2006 as retained in GB law:
| Metal | GB limit for food supplements |
|---|---|
| Lead | 3.0 mg/kg |
| Cadmium | 1.0 mg/kg |
| Mercury | 0.10 mg/kg |
| Arsenic | No limit set |
Because there is no arsenic limit, the checker shows your figure next to what UK sellers publish. In our audit of 20 UK shilajit products, published arsenic results ranged from 0.02 to 2.9 mg/kg.
If you give your daily amount, the checker also works out roughly how many micrograms of each metal that amount contains. A 300 mg daily amount of resin with 1 mg/kg lead contains about 0.3 µg of lead.
What can’t it tell you?
A report with good numbers is only useful if it is genuine and applies to your jar. Before you trust one, check:
- The lab. It should be a named, independent laboratory, ideally accredited to ISO/IEC 17025 (in the UK, by UKAS).
- The batch. The batch or lot number should match the one printed on your product.
- The date. A report for an earlier batch tells you nothing about yours.
- All four metals. A report that leaves out one of lead, cadmium, mercury or arsenic is incomplete.
Our guide to reading a certificate of analysis explains each section of a report, including units and detection limits.
What should I do if a result is over the limit?
Stop using the product and keep the packaging. In England and Wales you can report it to Trading Standards; in Scotland and Northern Ireland, contact your local council’s food safety team. Our page on shilajit’s UK legal status explains how.
If you have no report at all, ask the seller for one. In our audit, 7 sellers described their product as lab tested but didn’t show any report. Treat a “lab tested” claim with no document as untested.
Frequently asked questions
Is my data stored?
No. The checker runs entirely in your browser. The figures you type are not sent to us or anyone else.
What if my report shows ppm or ppb?
1 ppm is the same as 1 mg/kg, so choose mg/kg. For ppb or µg/kg, choose µg/kg and the checker divides by 1,000.
What if a result says <0.05 or ND?
Type it as shown, for example <0.05 or ND. The checker treats it as below the lab's reporting limit.
Does a pass mean the product is safe?
It means the figures on that report are within GB legal limits. It can't tell you whether the report is genuine, whether it is for the jar you bought, or whether the product contains other contaminants that weren't tested.
References
First published 23 October 2026. Spotted an error? Tell us and we'll correct it. Read our editorial policy.