A real lab report names the testing lab, the seller as client, and a batch number that matches your product, with a recent date. It shows identity and purity, plus endotoxin and sterility for injectables. A clean report describes one batch. It can't show that a peptide is safe or works for your dog.
What a COA can and can't tell you
COA stands for certificate of analysis. It is a lab's report on one batch of a product. For peptides sold to pet owners it is close to the only outside check you can get, because FDA doesn't check these products.
A good COA answers one question: what was in this batch on the day it was tested? It says nothing about whether the peptide helps, whether it is safe for your dog, or how much a dog absorbs. None of these peptides is officially tested in dogs or FDA-approved for animals, and a clean report doesn't change that. Your vet comes first, and this guide is for the owner who wants to read the paperwork properly. The sources page has a short version.
How to read a COA, line by line
Go through these checks in order. One failure is enough to stop trusting the document.
| Check | What a good report shows | Red flag |
|---|---|---|
| Lab | A named lab with an address, separate from the seller | No lab name, or a logo only |
| Client | The seller you are buying from | Another company's name |
| Batch | A batch or lot number that matches your vial or packet | "N/A", a blank, or a number not on your product |
| Date | A test date that fits the batch and isn't years old | No date, or one before the batch was made |
| Identity | Mass spectrometry confirming the expected molecule | Identity claimed with no method named |
| Purity | HPLC with a percentage and a chromatogram | A round number with no method or trace |
| Amount | Measured content per vial, against the label | Purity shown, but no amount |
| Endotoxin | An LAL test result, for anything injected | Not tested, on an injectable product |
| Sterility | A sterility test result, for anything injected | Not tested, on an injectable product |
What the results really mean
Identity, purity and amount are three separate answers. Identity says the right molecule is there. Purity says what share of the sample is that molecule. Amount says how much is in the vial. A report can pass one and fail another. When researchers tested semaglutide vials bought online, the drug content ran 29 to 39 percent over the label, while purity was 7.7 to 14.4 percent against the 99 percent the labels claimed.
The name itself needs care. FDA reports that multiple salts and derivatives have been sold as BPC-157, and that a free base and an acetate are different substances. In one nomination it reviewed, the named substance didn't match what was on the certificate of analysis. So check that the report names the same form as your label.
High purity doesn't mean clean. The same semaglutide vials had no live germs at the time of testing, yet endotoxin was present in all of them. FDA notes that endotoxin isn't removed by sterilizing filters. That is why injectables need both tests: sterility looks for live germs, and the LAL test looks for the toxin they leave behind. Results also apply to the sealed batch. A report can't tell you what happens once a vial is mixed and stored at home.
An accredited lab counts for more. A lab that meets ISO/IEC 17025 has shown both technical competence and a working quality system. Ask which tests its accreditation covers, since the certificate may not include the one you care about.
Why "third-party tested" badges prove little
A badge is a claim, and a claim isn't a document. "Third-party tested" doesn't tell you which lab, which batch, which tests or what the result was. It could describe one test on one old batch of something else. These patterns turn up on pet peptide sites, and each one fails the checks above:
- A badge or a line of text, with no document behind it
- "Reports available on request", with nothing published
- A page that promises reports will appear later
- A certificate issued to a different company, with no batch number
- A screenshot cropped to hide the lab, client or date
Oral versus injectable: which tests matter
The form decides what a report has to show. Neither form has been tested in a clinical trial in dogs.
| Item | Injectable vial | Oral capsule, oil or treat |
|---|---|---|
| Must be sterile? | Yes | Not in the same way, though microbial quality still matters |
| Endotoxin test | Essential | Less critical, but still worth seeing |
| Immune reaction concern | Higher, FDA says | Generally lower, FDA says |
| Absorption data in dogs | BPC-157 only, from healthy beagles | None we could find |
| Other ingredients | Solvents and fillers matter | Oils, flavors and proteins matter, especially on a diet trial |
| What the report should cover | The finished vial's batch | The finished product's batch, not just the raw powder |
How to check it yourself
Ask the seller for the report for the exact batch on your product, before you pay if you can. Then contact the named lab and ask whether the report number is genuine. If the lab can't confirm it, treat the report as unproven. Compare the batch number on the paper with the one on the packet. If a seller won't provide a batch-matched report, you have your answer.
Our seller comparison records what each seller publishes, with the date we checked, because lab documents change. For what can still go wrong with a genuine product, read are peptides safe for dogs?
Show the report to your vet
Vets usually start with a diagnosis and tested treatments, so see one before starting any new product, and straight away if your dog reacts to one. These reports may be new to your vet, but your vet can still tell you how a product fits with your dog's condition and medicines. Bring the label, the report and the seller's page. A licensed online vet can do this too.
- Does this product fit my dog's diagnosis at all?
- Would it clash with any medicine or planned procedure?
- Is there a tested option we haven't tried?
Dutch and Vetster connect you with a vet by video or chat. Ask how urgent it is, and whether anything you have read about makes sense. Start a vet chat Paid link
Questions dog owners ask
What is a COA for peptides?
COA means certificate of analysis. It is a lab's report on one batch, showing things like identity, purity and test date. A useful one names the lab, the client and the batch. It tells you what was in that batch, and it can't show that a peptide is safe or works.
What should a peptide COA include?
The lab's name, the seller as client, a batch number that matches your product, a test date, identity by mass spectrometry and purity by HPLC, and the measured amount. For anything injected, it should also show endotoxin and sterility results.
Does "third-party tested" mean a peptide is safe?
No. It is a marketing claim unless you can see the report. It doesn't say which lab, batch or tests were involved. Even a real report only covers that batch, and it says nothing about safety in dogs.
Is 99 percent purity on a peptide label reliable?
Not on its own. In one study of semaglutide vials bought online, labels claimed 99 percent and measured purity was 7.7 to 14.4 percent. Ask for a batch-matched report from a named lab, and remember that high purity doesn't rule out endotoxin.
Do oral peptide products need a lab report too?
Yes. A report still shows whether the product holds what the label says. Sterility matters less than for a vial, but identity, amount and other ingredients still matter, and nobody has published how much of an oral peptide a dog absorbs.
Sources
- Ashraf AR et al. Multifactor quality and safety analysis of semaglutide products sold by online sellers without a prescription. J Med Internet Res, 2024. Open
- FDA, Briefing Document, Pharmacy Compounding Advisory Committee, 23 to 24 Jul 2026 (BPC-157). Open
- FDA, Bacterial Endotoxins/Pyrogens, inspection technical guide. Open
- NIST, Joint ISO-ILAC-IAF Communique on ISO/IEC 17025. Open
- He L et al. Pharmacokinetics, distribution, metabolism and excretion of BPC157, including in beagle dogs. Front Pharmacol, 2022. Open
- Janvier S et al. Impurity profiling of the most frequently encountered falsified polypeptide drugs on the Belgian market. Talanta, 2018. Open
- FDA, Approved Animal Drug Products (Green Book). Open