The case against the document we’ve spent this whole cluster defending
A Certificate of Analysis is the best evidence a supplement brand can hand you. It is also routinely asked to carry weight it cannot hold, and the fastest way to show that is to keep reading our own six documents past the part that flatters us.
Nothing below is a scandal. Every item is ordinary, and that’s the point — these are the normal limits of an ordinary document, and knowing them is the difference between using a COA and being reassured by one.
1. It covers one lot, and possibly not yours
The disclaimer at the foot of every one of our COAs says the reported values relate only to the product tested. That is not lawyerly throat-clearing; it’s the accurate scope of the entire document.
And a lot is not a product. Our two Lion’s Mane batches came back with a 25× difference in arsenic, both passing. If a brand shows you one lot’s document and you generalise it to the range, you’ve done something the document explicitly told you not to.
Worth adding, since we’re being thorough: our Lion’s Mane lot 2023-13956 — the best-documented batch we have, the one with the full ICP-MS panel — carries a manufacturing date of August 2023 and an expiration of August 2026. It reaches the end of its stated shelf life this month. A genuine, complete, passing COA can describe a batch that is no longer on anybody’s shelf.
2. The panel is the scope. Absence is not a pass
This is the most common misreading in the category, so it’s worth stating flatly: a test that does not appear on a COA did not come back clean. It did not happen.
Three of our five products have a document covering microbiology and nothing else. There is no metals result, no potency result, no identity confirmation. Not because those came back badly — because they were never run. A brand can hold up a COA for every product in its range while three of those documents establish only that the batch wasn’t microbially contaminated.
The corollary: always read the list of tests before reading any result. The list is the finding.
3. A missing Specification column makes results unjudgeable
Our three microbiology-only documents have three columns: Test, Method, Result. There is no Specification column.
So a result of <100cfu/g sits there without the limit it was measured against. Is that comfortably clean or scraping through? You cannot tell from the document. Compare with our Lion’s Mane COA, which prints ≤ 100,000 CFU/g next to a result of 1,140 cfu/g and lets you do the comparison yourself.
Two documents, both honest, and only one of them lets you check the work.
4. N/A is a row, not a result
Each of those three documents lists a test line for gluten. The result reads N/A.
A test row with no result is not a gluten finding. It’s a form field that wasn’t filled, and it sits in the table looking exactly like the rows above it that were. We do not claim Gluten Free as a brand attribute, and this is one reason — gluten status is a per-label question you read off the specific product’s own panel, never inferred from a line item that was never run.
5. Forms don’t always get finished
At the bottom of our Focus Strips COA, in the Notes, is this line:
Remarks: The product complies / does not comply with specification.
Both options. Neither struck through.
It’s a template line nobody deleted, and reading the document as a whole makes the intent obvious — every individual test on it passes, so the batch plainly complies. We’re not suggesting otherwise. We’re pointing at it because it’s a useful reminder that a COA is a document produced by people filling in a form, and forms have unfinished corners. Read the results, not the summary line. That advice generalises well beyond this one PDF.
6. Dates are not always unambiguous
Three of our COAs carry dates written as 08/04/2026 and 10/04/2026.
Those could be August 4th and October 4th, or the 8th and 10th of April. The document doesn’t say which convention it’s using. In our case the ambiguity is resolvable — we downloaded these files in mid-July 2026, so an August or October date is impossible and they must be April — but that resolution came from information outside the document.
If you’re checking a brand’s paperwork, a date you can read two ways is a date you should ask about. It’s also, in fairness, one of the more forgivable defects on this list.
7. Identity is not potency, and potency is not identity
Our Focus Strips COA confirms all four mushroom species by LC-MS, matching retention times against known standards. That establishes the right organisms are present. On its own it would say nothing about how much of each is there — a trace would satisfy an identity test.
That document happens to also carry an assay, so we get both. But plenty don’t, and “confirmed by LC-MS” reads impressively while answering only half the question. Potency against label claim is the other half.
8. A number can measure a broader thing than you asked
Our Lion’s Mane COA reports total polysaccharides — label claim 400 mg, result 401.78 mg, method UV-VIS. That’s a real reconciliation and we’re glad to have it.
It is not a beta-glucan figure. Beta-glucans are the fungal polysaccharides; starch is also a polysaccharide, and a UV-VIS total does not separate the two. So the number confirms the label’s stated 40% polysaccharide standardisation, and it does not tell you how much of that fraction is mushroom rather than growing substrate. We do not have a beta-glucan split for any product, and we’re not going to convert one number into the other to manufacture one. The full version of this argument, including what it implies about our own capsules, is in fruiting body, mycelium, or grain.
9. It only answers what somebody asked
No COA we hold addresses caffeine. Not one. So we do not claim caffeine-free anywhere on this site, even though no ingredient in the range carries a caffeine source, because “we can’t find a reason it would be there” is reasoning and a spec sheet is evidence. That claim stays off the site until the specification sheet confirms it.
The general form: a COA answers the questions the manufacturer commissioned. Anything nobody paid to ask is simply absent, and absence looks identical to “not applicable” once it’s off the page entirely.
10. It says nothing about whether the product works
The disclaimer on our COAs is explicit that the laboratory makes no claims as to the efficacy, safety, or other risks associated with the levels reported. The lab measured what’s in the batch. Whether that quantity of that compound does anything for a person is a question about clinical trials, not about chromatography.
This matters because a thick COA is genuinely persuasive, and the persuasion leaks. A verified dose is not an effective dose. Ours are verified and, measured against the doses used in the published human trials on these ingredients, they are not trial doses — which is why nothing on this site promises you an outcome, and why no result on any of these documents is ever offered as evidence that a product will do something for you.
The honest summary
A Certificate of Analysis tells you: this batch, on this date, was measured for these specific things, by this method, against these limits, and here is what came back.
It does not tell you about the next batch, about tests nobody ran, about limits the document omitted, or about what any of it will do inside a person.
That’s still an enormous amount more than most brands will give you, which is why the right response to all of this is not to dismiss the document but to ask for it and read it properly. How to request a COA is the practical version, and what a Certificate of Analysis actually is is the structure this article has spent its whole length poking holes in.