What should a certificate of analysis tell you about a jar of shilajit? Three things, and only three: that this batch was tested by a named laboratory, that it was screened for the contaminants the category actually carries, and that the fulvic content was measured on the finished product rather than on something upstream of it. A document that does all three is worth reading closely. Most do not, and the reason is more interesting than simple dishonesty.
Shilajit is a geological exudate. It comes out of rock, and it brings the rock’s chemistry with it, which is why heavy metals are the category’s one non-negotiable safety question rather than a box to tick. Purification is what turns the raw material into a supplement, and a certificate is the only public evidence that purification did what it claims.
So the document matters more here than in almost any other supplement aisle. Before you compare price, format or origin story between one shilajit resin and another, learn to read the paperwork — it takes about two minutes once you know what you are looking at.
What is actually on a shilajit COA?
A certificate is a table of assays, each naming a method, a result and a specification limit. The anatomy below covers what a serious one includes. Anything missing from this list is missing because someone decided not to test it.
| Section | What it should show | Why it matters |
|---|---|---|
| Identification | Product name, lot or batch number, date | Ties the document to your specific jar |
| Laboratory | Named lab, accreditation such as ISO/IEC 17025 | “Third-party tested” without a name is not evidence |
| Heavy metals | Lead, arsenic, cadmium, mercury, each with a result | The category’s real safety issue |
| Microbiology | Total plate count, yeast and mould, pathogens | Relevant to a moist, unheated resin |
| Fulvic content | A percentage with the method stated | The active fraction, and the most-manipulated number |
Who decides what gets tested?
The person paying for the test — and this is the single most useful thing to understand about certificates of analysis. A laboratory does not audit a product. It runs the assays it was asked to run and reports what it found. So a certificate showing no arsenic result is not evidence of no arsenic; it is evidence that nobody ordered the arsenic assay.
Which turns a clean-looking document into an ambiguous one. A COA with four heavy metals and a full microbial panel tells you a brand went looking for problems. A COA with lead alone, or with a general “heavy metals: pass” line and no per-element figures, tells you far less than its layout suggests, because a pass against an unstated specification is a claim wearing a table’s clothing.
This asymmetry is exactly why aggregated resources are useful. A grading project such as the shilajit transparency database can compare what each brand chose to test across hundreds of products at once, which is a comparison no individual buyer can perform from a single PDF and no brand has any incentive to publish.
Why do fulvic acid percentages disagree so wildly?
Because the number depends on two things the label never mentions: what was measured, and how. On the what, a percentage can describe an unblended raw extract or the finished product you swallow, and those figures can differ by an order of magnitude once carriers and other ingredients are in the jar. The higher number is usually the one that reaches the marketing.
On the how, fulvic acid is not a single molecule but a class of related compounds, and the assays used to quantify it do not agree with each other. Different methods on the same sample can return meaningfully different percentages, all of them honest. This is why a COA that states its method is more trustworthy than one reporting a bigger number in isolation, and why comparing “76% fulvic” against “85% fulvic” across two brands is usually a comparison of two laboratories rather than of two products.
The practical version: treat any fulvic percentage without a stated method and a stated sample as decoration.
How do you read the heavy metals section?
Look at three columns and ignore the rest. The result, the specification limit it is measured against, and the detection limit of the method used.
| What you see | How to read it |
|---|---|
| A number with a limit beside it | Best case — you can judge the margin yourself |
| “Not detected” or “ND” | Only meaningful if the detection limit is printed |
| “Complies” or “Pass” | Complies with what? An unstated spec means nothing |
| Lead tested, nothing else | The cheapest possible screen for this category |
| No lot number anywhere | The document may describe a batch you never bought |
Does any of this connect to the research?
Directly, and it is the reason to care. The human trials that make shilajit worth discussing all used purified, standardised material at a stated dose: the 90-day testosterone study in the journal Andrologia ran on purified material at 250 mg, taken twice a day, and the eight-week work on muscular fatigue reported in the Journal of the International Society of Sports Nutrition used a standardised extract at two dose levels. Purified and standardised are not adjectives in those papers. They are the intervention.
A product that cannot document purity or content is therefore not a budget edition of the studied material. It is an unstudied substance sharing a name, and no amount of Himalayan photography closes that gap. The certificate is where a brand either bridges it or quietly declines to.