What third-party testing does and doesn't cover
Third-party testing covers four separate questions, and one certificate rarely answers all of them. Identity confirms the powder is what the label says. Potency measures the compound per dose. Heavy metals screen for lead, cadmium, arsenic and mercury at parts per billion. Microbes screen for total plate, yeast and mould. A lab can run any subset and still print something called a certificate of analysis.
A full panel costs a brand around $400 per lot, which is why some order one and not the rest.
That last figure matters, because 4 panels is the number most buyers assume they get when they see a passing result.
The word third-party means the lab doesn't work for the brand. It doesn't mean the lab tested everything you care about.
Why one panel isn't the same as four
A brand can order an identity assay only, receive a one-page result, and describe the product as third-party tested in perfectly accurate language. Potency is the assay that catches a 300 mg label claim delivering 240 mg. Microbes is the panel that matters for a powder sitting in a warehouse for 18 months. Heavy metals is the panel that matters for anything mined from the ground, which covers every mineral on the shelf. Ask which of the 4 were run. Ask for the lot code the certificate belongs to. Ask for the lab name and its accreditation.
Testing is voluntary in most of this market. That's the part buyers find hardest to believe.
| Panel | Question | Reported in |
|---|---|---|
| Identity | Is it the right material | pass or fail |
| Potency | Is the dose on the label real | mg per g, or percent of claim |
| Heavy metals | Lead, cadmium, arsenic, mercury | ppm, against a limit |
| Microbes | Plate count, yeast, mould | cfu per g |
Why the lot code is the only link that matters
A certificate is a receipt for one lot of powder, and supplement production runs in lots of a few thousand bottles at a time. Brand A ships 12 production lots in a year and holds certificates for 4 of them. Brand B holds one for every lot and publishes the codes. Both can say third-party tested without stretching the truth, and the difference is what you can verify about the bottle in your kitchen.
What a clean panel still can't tell you
A passing heavy metals result means the batch sits under the limit the lab applied, and different labs apply different limits. A result of 0.4 ppm lead reads as a pass against one threshold and a question against another. Ask which limit the lab used before you treat the word pass as a conclusion. That's the detail most buyers never see, and it separates a useful certificate from a decorative one.
What we run, lot by lot
Every production lot of every product we ship gets all 4 panels from an accredited lab, and the code is printed on the base of each bottle so you can match the paper to the container in your hand. Our CoQ10 softgels carry 100 mg of ubiquinone per softgel at $0.28 per day on a 90-count bottle, and the potency assay for that product reads against the label claim rather than against a generic specification. Testing one lot in twelve says nothing about the other eleven, and brands that show you one certificate for a whole product line are showing you a sample, not a system.
Here is the limit worth stating plainly. Clear results describe the lot, not your body. They can tell you the powder is what it claims and free of the 4 contaminants the panel looked for. They can't tell you whether the finished softgel does anything for you, because that's a question about you.
Two questions worth asking before you buy
Which batch was tested, and which of the 4 panels did the lab run? A brand that answers both with specifics is worth the extra $0.05 per day. A brand that answers with the word tested and nothing else has told you almost nothing, and at $0.28 per day across a 90-count bottle you're paying $25.20 for that answer. Ask the two questions, read the response, and decide from what's actually there instead of from the logo printed on the certificate. A brand selling at $0.28 per day owes you a lot code and a lab name before it owes you a marketing sentence, and the ones that answer plainly are worth the reorder.
Frequently asked questions
What does a certificate of analysis cover?Show answerHide answer
Whatever assays were ordered. Ask which were run before assuming anything.
Is testing legally required?Show answerHide answer
Verification is voluntary in most of the market, which is why brands differ so much.
What should I ask a brand?Show answerHide answer
Which batch was tested, by which lab, and for which four things.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
