Where to get peptides tested — and how to choose a lab.
If you buy, sell, or research peptides, sooner or later you need a number you didn't get from the person selling to you. The good news: independent testing is a mail-in service — you don't need a lab in your city, you need a lab you can trust with a vial and a tracking number. The hard part is telling a real analytical lab from a rubber stamp. Here's how.
(Yes, we are one of the options — KMD Analytical is an independent RP-HPLC lab in Chatsworth, California. This guide is written so you can hold any lab to it, including us.)
The seven questions that expose a weak lab
- Who pays you, and for what? A testing lab should have one revenue stream: testing. A lab owned by, funded by, or affiliated with a peptide vendor is not third-party, whatever the label says.
- Do you run certified reference standards?Identity means “matches the reference standard” — retention time and UV character against known material. No reference standard, no identity claim.
- Will I see my actual vial on the certificate? Chain of custody is the whole game. A lab that photographs your vial at intake and prints that photo on the COA can prove it tested yoursample. A lab that can't, can't.
- Do you report content in milligrams, or only purity %? Purity alone is the oldest trick in the business — a 99% pure vial can still be half-empty. Demand the net-peptide assay.
- Can a stranger verify the certificate? A PDF is editable. A serious lab seals each COA (ours carry a SHA-256 fingerprint checkable at /verify) so a forged or reused certificate fails in public.
- Do you publish failing results?Ask to see what a DOES NOT CONFORM certificate looks like. A lab that has never failed a sample is not testing — it's decorating.
- Who do I talk to when a result surprises me? You want the analyst, not a ticket queue. Surprising results deserve a conversation about method, reference standards, and repeat runs.
What the process looks like when it's done right
Order first, ship second: you enter each vial on the lab's order form (compound, labeled mg, your lot number), get an order reference, write it on the package, and mail the sealed vial. On arrival the lab matches the box to the manifest, photographs each vial, and starts the clock. Results should come back per vial as each completes — identity, purity, and content on a certificate you can verify without trusting anyone. The full walk-through is in how third-party testing works.
What it should cost
In the US, honest independent testing of a single research peptide vial — identity, chromatographic purity, and net-peptide assay — runs in the $100–$150 per vialrange, with volume pricing as batches grow, and 7–10 business days from receipt. Dramatically cheaper usually means one number (purity %) and no reference standard; dramatically slower usually means a broker shipping your sample to someone else's bench. Our full schedule is on the pricing page.
One vial is the price of certainty
Testing consumes the sample. That's not a flaw — it's the trade: one vial from the batch, in exchange for knowing what the other ninety-nine are. For anyone selling under their own name, that's the cheapest insurance in the business.