Most people buying Shilajit never look at the Certificate of Analysis. That's a mistake.
A COA is the single most important document a supplement brand can provide. It's the difference between a marketing claim and a verified fact. And for a substance like Shilajit — a geological product that naturally accumulates minerals from its environment — it's not optional.
This guide walks you through every section of a Shilajit COA, what the numbers mean, what acceptable limits look like, and how to tell a genuine third-party COA from one that's been produced to deceive.
What Is a Certificate of Analysis?
A Certificate of Analysis is a document issued by a laboratory after testing a product sample. It records the results of specific tests — chemical composition, contaminant levels, microbial counts — and confirms whether the product meets defined specifications.
For supplements, a COA serves two purposes. First, it verifies that the product contains what the label claims. Second, it confirms the product is free from harmful contaminants at levels that would pose a risk to health.
The key word is independent. A COA from a brand's own in-house lab is not meaningful verification — the lab has a financial interest in the outcome. A COA from an accredited third-party laboratory like Eurofins carries weight because the lab has no stake in the result.
Why Shilajit Specifically Needs Third-Party Testing
Shilajit is not a synthesised supplement. It's a geological substance — compressed organic matter that has absorbed minerals from surrounding rock over millions of years.
That's what makes it bioactive. It's also what makes it potentially risky if untested.
Because Shilajit forms in rock, it can accumulate heavy metals — lead, arsenic, cadmium, and mercury — from its geological environment. These metals occur naturally in mountain rock. Without proper purification and testing, they can be present in the final product at levels that cause harm over time.
Reputable producers purify raw Shilajit using a water-based process that removes impurities before concentrating the active compounds. But purification alone isn't proof. A COA from an accredited lab is the only way to confirm the final product is clean.
This is why at Golden Shilajit Official, every batch of purified Himalayan Shilajit resin is tested by Eurofins — one of the world's largest accredited analytical testing networks — before it reaches customers.
The Sections of a Shilajit COA
1. Product Identification
The top of a COA should clearly identify:
- Product name — should match the product you purchased
- Batch or lot number — links the COA to a specific production run
- Sample receipt date and test date — confirms the COA is current
- Testing laboratory name and accreditation number
If the batch number on the COA doesn't match the batch number on your product packaging, the COA may not apply to what you received. Reputable brands test every batch, not just once at launch.
2. Fulvic Acid Percentage
This is the most important figure on a Shilajit COA.
Fulvic acid is the primary bioactive compound in Shilajit. Its concentration determines the potency of the resin. A quality purified Shilajit resin should contain 40–55% fulvic acid by dry weight.
What to look for:
- The result is expressed as a percentage of dry weight (not wet weight)
- The testing method is named — look for the modified Lamar method or UV spectrophotometry
- The result falls within the 40–55% range
Red flags:
- No fulvic acid figure at all
- A figure below 20% without explanation
- Wet-weight measurement (which inflates the apparent percentage)
- No testing method listed
3. Humic Acid Percentage
Humic acid is a related compound in the humic substance family. It's present in Shilajit but is less bioavailable than fulvic acid due to its higher molecular weight.
A typical Shilajit COA will show humic acid at a lower percentage than fulvic acid. If humic acid is listed higher than fulvic acid, that's unusual and worth questioning — it may indicate a lower-quality source material or a product that has been diluted or adulterated.
4. Heavy Metal Testing
This section is non-negotiable. Every Shilajit COA should include results for at least four heavy metals:
| Metal | Safe Upper Limit (USP) | What to Look For |
|---|---|---|
| Lead (Pb) | ≤10 µg/day | Result well below limit |
| Arsenic (As) | ≤10 µg/day | Result well below limit |
| Cadmium (Cd) | ≤4.1 µg/day | Result well below limit |
| Mercury (Hg) | ≤2 µg/day | Result well below limit |
Results are typically expressed in parts per million (ppm) or micrograms per gram (µg/g). To assess safety, multiply the concentration by the daily dose weight.
Red flags:
- Heavy metals not tested at all
- Results listed as “pass/fail” without actual numbers
- No reference to the testing standard used (USP, EU, or equivalent)
5. Microbial Testing
Microbial contamination is a risk in any natural product. A complete Shilajit COA should include results for:
- Total Aerobic Plate Count (TAPC) — total bacterial load
- Total Yeast and Mould Count
- E. coli — should be absent or below detection limit
- Salmonella — should be absent
Acceptable limits follow USP or EU pharmacopoeia standards for dietary supplements. The COA should state which standard was applied.
6. Moisture Content
Moisture content affects the concentration of active compounds. A high moisture content means you're getting less resin per gram of product. Most quality Shilajit resins have a moisture content below 20%.
7. Laboratory Accreditation
The credibility of a COA depends entirely on the credibility of the lab that produced it.
Look for:
- ISO/IEC 17025 accreditation — the international standard for testing laboratories
- Named accreditation body — such as UKAS (UK), A2LA (USA), or DAkkS (Germany)
- Accreditation number — verifiable on the accreditation body's public register
Eurofins holds ISO/IEC 17025 accreditation across its global network and is one of the most widely recognised names in food and supplement testing. A Eurofins COA carries significant weight precisely because the lab's accreditation is publicly verifiable.
BSCG (Banned Substances Control Group) certification adds a further layer — it confirms the product has been screened for over 500 substances banned in sport and for pharmaceutical adulterants.
How to Spot a Fake or Misleading COA
Generic or undated documents. A COA with no batch number, no test date, or a date from several years ago may not apply to the product you're buying.
In-house lab results. If the testing laboratory is the same company as the brand, or shares an address with the brand, the result is not independent.
Pass/fail only. A COA that shows only “pass” or “compliant” without actual numerical results gives you no way to verify the claim. Legitimate COAs show the measured value alongside the specification limit.
Unverifiable lab names. Search the laboratory name on the relevant accreditation body's register. If it doesn't appear, the accreditation claim is false.
Mismatched batch numbers. Always check that the batch number on the COA matches the batch number on your product.
What a Good COA Looks Like: A Checklist
- COA is from a named, accredited third-party laboratory
- Laboratory accreditation is ISO/IEC 17025 and publicly verifiable
- Batch number on COA matches product packaging
- Test date is recent (within 2 years, ideally within 12 months)
- Fulvic acid percentage is disclosed (50–80% dry weight)
- Testing method for fulvic acid is named
- Heavy metals tested: lead, arsenic, cadmium, mercury — with actual numbers
- Heavy metal results are within USP or equivalent limits
- Microbial testing included: TAPC, yeast/mould, E. coli, Salmonella
- Moisture content disclosed
- BSCG or equivalent certification available (bonus)
Frequently Asked Questions
Where can I find the COA for Golden Shilajit Official products?
The Eurofins COA for each batch is available directly on the product page. You don't need to request it — it's there by default, because transparency is the baseline, not a feature.
What does “dry weight” mean on a COA?
Dry weight means the measurement was taken after moisture was removed from the sample. It's the correct standard for reporting active compound concentrations because it removes the variable of water content. A wet-weight figure will always appear higher and is less meaningful for comparison.
Can I verify a COA myself?
Yes. Take the laboratory name and accreditation number from the COA and search the relevant accreditation body's public register — UKAS for UK labs, A2LA for US labs. If the lab appears on the register with a current accreditation, the COA is from a legitimate source.
How often should a Shilajit brand test its product?
Every production batch should be tested independently. A single COA from years ago does not verify current stock. If a brand can't tell you which batch your product is from or provide a matching COA, that's a significant gap in their quality assurance.
What's the difference between a COA and a specification sheet?
A specification sheet lists what a product is supposed to contain — it's a target. A COA lists what a specific batch actually contains — it's a result. Only the COA tells you what's in the product you're buying.
Is BSCG certification the same as a COA?
No — they're complementary. A COA from a lab like Eurofins verifies composition and contaminant levels. BSCG certification confirms the product has been screened for banned substances and pharmaceutical adulterants. Both together provide the most complete picture of product safety and integrity.
Conclusion
A Certificate of Analysis is not a marketing document. It's a technical record — and reading it correctly gives you more reliable information about a Shilajit product than any label claim, testimonial, or brand story.
The key figures are fulvic acid percentage, heavy metal results, and microbial testing. The key requirement is that the lab is independent, accredited, and named.
If a brand won't share its COA, or shares one that doesn't hold up to the checks in this guide, that tells you everything you need to know.
For more on what makes Shilajit authentic from source to shelf, read our complete guide to authentic Himalayan Shilajit. To understand what fulvic acid is and why its percentage matters, see What Is Fulvic Acid and Why Does It Matter in Shilajit?