What gets tested in a batch of desiccated liver tablets
An email with a certificate attached
Identity, potency, heavy metals and microbes are four separate questions, and one panel rarely answers all of them at once, which is exactly what people mean when they ask about third party tested supplements. A reader forwarded me one of these certificates last month, three pages of tables with a batch number in the corner, and no idea which rows mattered. We went through it together over coffee.
What does a certificate of analysis cover? Whatever assays the brand ordered, and nothing more. That's the sentence worth keeping.
The four questions every batch must answer
Identity asks whether what's in the tablet is what the label says, confirmed against a reference standard. Potency asks how much of it there is, and the row usually reads in mg per serving, because a tablet can be genuine and still come up short. Desiccated liver capsules commonly hold around 500 mg of dried organ each, with servings of 6 capsules, so the arithmetic is easy to check against the label. Heavy metals are measured at ppm levels, and microbes are the hygiene check that matters most for a product made from raw organ material. Four assays, four sets of equipment, and a brand that tested only one of them has answered a quarter of the question.
Each row on the certificate usually names the method used alongside the result, which sounds like decoration and isn't. The method is what makes one lab's number comparable to another's, the way a scale in kilograms and a scale in pounds can both be honest without agreeing. If a result has a method and a date and a signature, it can be checked by someone else. If it has only a number, it can only be admired.
Verification at this level is voluntary across most of the market, which is why two bottles that look identical on a shelf can sit at completely different levels of diligence, and why third party tested supplements differ so much in what their paperwork actually shows. The claim lives in the documents, not in the packaging.
What third party tested supplements actually guarantee
The phrase means an independent lab ran the ordered assays, not that the product is approved by anyone. Third party describes who held the equipment, tested describes what was checked, and neither word promises the result was good. Read the certificate the way my reader eventually did: find the batch number, match it to your bottle if it's printed, then check which of the four rows appear at all. Absence of a row is information, just not the flattering kind.
Batch coverage is the other half of the guarantee question. A brand can test honestly and still only test every few lots, so the certificate you're shown may describe a cousin of your bottle rather than the bottle itself. Ask how often batches are tested, and listen for a number. Every batch is the strong answer. Every few is workable. Never is commoner than anyone would like.
What to ask a brand, in one email
Three questions, sent once: which batch was tested, by which lab, and for which of the four things. A confident answer arrives within 2 days and names the lab outright. A vague answer tells you something too. Certificates are cheap to request and expensive to fake, which is precisely why the request works. A good answer tends to mention an accredited lab, sometimes with a reference to the ISO 17025 standard that governs testing laboratories, and it arrives without defensiveness. Brands with nothing to hide answer quickly because the question costs them a forward button. Brands without the answer take longer, and their silence is structured differently from a busy week's.
One honest limit
The whole exercise has a ceiling worth naming before you start. A certificate tells you about a powder on a date, not about what a finished tablet does in a person, and no panel of any kind speaks to that. Keep the expectations on the paperwork's side of the line and the documents stay useful.
A clean panel describes one batch, not the next one, and not the tablet in your cupboard from last year, so the paperwork is a snapshot with a shelf life of its own, true even for third party tested supplements with spotless histories. That's a limit, not a reason to skip it. My reader's 3 pages checked out on identity and potency, stayed quiet on metals, and the brand answered the metals question within 36 hours. The bottle stayed. The reader stayed sceptical, which is the correct resting state.
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.
