“Third-party tested” is one of the most common claims in this category and one of the least informative on its own. A Certificate of Analysis — a COA — is the document that turns that phrase into something you can check. Reading one is not difficult, but it does require knowing which five things to look for.
A COA is a laboratory document reporting what was tested, on which material, by which method, and what the results were. Its value depends almost entirely on four things: whose document it is, which lot it covers, whether it tested the finished product, and whether the potency line is a measured result or a restatement of the label.
Question 1 — Whose document is this?
Look for the name of the laboratory and its accreditation status. ISO 17025 is the international standard for testing-laboratory competence; a COA from an accredited laboratory names that laboratory. A summary graphic produced by the brand, a certificate with no laboratory identified, or a table of results retyped into brand-styled marketing collateral are all different objects from a laboratory document.
Question 2 — Which lot, and does it match your bottle?
A COA describes one specific production lot. That is its entire value: it is not a general statement about the product line but a record of a batch. Find the lot number on the document and compare it to the lot number printed on the bottle you own.
If a brand publishes one COA and links to it from every product page indefinitely, that document tells you about one batch from one point in time. It does not describe the bottle you were shipped last week unless the lot numbers match.
Question 3 — What was actually tested?
“Tested” is a category, not a result. Different tests answer different questions, and a document can be entirely legitimate while covering far less than a reader assumes:
- Identity — confirms the material is what it is labeled as.
- Potency or activity — measures functional enzyme activity, typically in SPU for serrapeptase.
- Heavy metals — a contamination screen against specified limits. It says nothing about potency.
- Microbial — evaluation against specified microbial criteria. Also a contamination check, not a performance one.
- Disintegration — a physical test of how the finished dosage form behaves in defined media. See what USP <2040> actually tests.
A COA covering heavy metals and microbial limits is a purity document. It is not evidence of potency, and it is not evidence about delivery. Read the categories present rather than the word “tested.”
Question 4 — Is the potency line declared or measured?
This is the distinction most often lost. A declared specification is the figure the product is formulated to — a label commitment. A measured result is what the assay found in the sample from that lot. A COA that restates the label figure in its results column, with no separate measured value, has not told you what was measured.
Look for two numbers: the specification and the result. Where only one appears, determine which one it is before treating it as evidence. This distinction is covered on its own terms in Declared Potency vs. Measured Enzyme Activity.
Question 5 — Finished product, or raw material?
A raw-material COA describes the ingredient a manufacturer purchased. A finished-product COA describes the capsule you swallow. Both are real documents; they answer different questions. Manufacturing, encapsulation, and storage all sit between them.
This matters most for delivery claims. Disintegration testing is only meaningful on a finished capsule, because the capsule shell is the thing being tested. A raw-material document cannot speak to it at all.
Red flags
- No lot number, or a lot number that does not correspond to anything printed on the bottle.
- No date on the document, or a document dated years before the product you were shipped.
- No laboratory named, or no accreditation status stated.
- A results column that repeats the label specification with no separately measured value.
- A brand-designed summary graphic offered in place of the laboratory document itself.
- A raw-material COA presented as evidence about the finished capsule.
- A single document offered as evidence for every lot the brand has ever shipped.
What a COA cannot tell you
A COA reports measurements. It does not report outcomes. No laboratory document about a capsule can describe what happens in a body, and a result measured in defined laboratory media is a statement about that test, not about digestion. Treat a COA as evidence of composition and physical behavior — which is genuinely useful, and is also the limit.
How iSerra approaches it
Every iSerra™ production lot is submitted for a 14-test panel prior to release, and identity, potency, heavy-metals, and microbial results are documented on an independent, ISO 17025-accredited laboratory Certificate of Analysis. Customers enter the lot number from their own bottle through Veriphase™ and view that lot’s own documented results, rather than a summary of them.
Veriphase™ is a lookup and access system, not a testing process: the independent laboratory testing happens first and separately, and Veriphase™ is how a specific bottle’s document is retrieved. The full category-by-category breakdown is in The 14 Tests Behind an iSerra Production Lot.
Disintegration testing under USP <2040> is part of iSerra’s finished-product testing program. At time of writing, its documentation is not confirmed to be captured within the same per-lot COA lookup record, so it is described on its own terms rather than folded into the Veriphase™ lookup claim.
Practical takeaway
Five questions, in order: whose document, which lot, what categories, declared or measured, finished product or raw material. If a brand cannot answer all five for the bottle in your hand, the claim “third-party tested” has not yet been substantiated for the thing you bought.
A COA is only as specific as the lot it names. Anything more general is marketing wearing a laboratory typeface.
ISO/IEC 17025 — general requirements for the competence of testing and calibration laboratories. USP <2040> — disintegration and dissolution of dietary supplements. Reference detail maintained on The Science.
iSerra™ per-lot 14-test panel; identity, potency, heavy-metals, and microbial results documented on an independent ISO 17025-accredited laboratory COA surfaced by lot through Veriphase™.
Published research on an ingredient, finished-product testing, and lot-specific testing are three different categories of evidence and are kept separate throughout the Journal. This article introduces no external findings beyond those referenced on The Science.