Guide
Eight checks. None of them require trusting us.
Every check below can be run on any supplier in this category, including this one, using information they will hand you before you buy. We have written it that way on purpose — a test only we could pass would be an advertisement, and worth nothing to the person applying it. Use it on us. Then use it on whoever else you are considering.
Is the certificate for the lot, or for the product?
A certificate that names a product line rather than a production lot tells you nothing about the vials in front of you. Look for a lot number on the document that matches the lot number on the vial. If the same PDF is sent to every buyer of that compound, it is a brochure.
Ask them: “Send me the certificate for the specific lot you would ship me.”
Can the lot be verified without asking the supplier?
A document you can only obtain from the party selling you the goods is a document you cannot check. Independent verification — a lot lookup you can reach, or the issuing laboratory confirming directly — is what turns a claim into a fact.
Ask them: “Where can my own customer verify this lot number without contacting you?”
Which laboratory ran the analysis, and does the document say so?
White-labelled certificates are normal in this trade and are not in themselves a problem. A certificate that has been re-branded so thoroughly that the originating laboratory is no longer identifiable is a problem, because nothing on it can be traced.
Ask them: “Which lab issued this, and is that name preserved on the copy I receive?”
What methods are reported, and against what specification?
Purity by HPLC area-percent, identity by mass spectrometry, endotoxin by LAL, net content. A certificate reporting a number with no method beside it is unfalsifiable. So is a purity figure with no stated release specification to fail against.
Ask them: “What is the release specification, and what happens to a lot that misses it?”
Is the certificate free, or an add-on?
Charging for documentation tells you how the supplier thinks about it. If a certificate is a paid extra or supplied "on request", it is being handled as a sales asset rather than as part of the goods — which raises the obvious question of what ships when nobody asks.
Ask them: “Is a lot-specific certificate included on every lot, at no charge?”
What does the supplier refuse to sell?
A catalog that carries everything, including compounds with obvious regulatory exposure and administration consumables, is telling you the supplier has not drawn a line. That is a risk you inherit as their customer, and it is visible before you ever place an order.
Ask them: “What have you deliberately kept out of the catalog, and why?”
Who are they willing to sell to?
A wholesale supplier that will also sell one vial to an individual is not operating a business-to-business model, whatever the site says. Approval gates are inconvenient by design, and their absence is information.
Ask them: “What do you verify before activating an account?”
Is pricing published, or extracted?
Quote-gated pricing is not automatically a red flag — genuine contract volumes are negotiated everywhere. But a supplier who will not show any price until you have handed over your company details is charging you in information before you have bought anything.
Ask them: “What does this cost at the quantity I actually intend to buy?”
What those checks return when you run them on us.
Stated plainly so you can hold us to it. Where a check exposes something we have not built yet, it says so rather than going quiet.
| Check | Certamer |
|---|---|
| Lot-specific certificate | Per production lot, never inherited from a product line or a previous batch. |
| Independent verification | Lot lookup for verified accounts, plus a QR code per lot on every invoice. If a document and the lookup disagree, the lookup governs. |
| Laboratory named | Preserved on every certificate, including white-labelled copies. Only the header brand changes. |
| Methods and specification | HPLC area-percent purity, MS identity, LAL endotoxin, net content, each reported against a stated release specification. |
| Cost of documentation | Free on every lot. Never an add-on. Re-branding a certificate is chargeable; the certificate itself is not. |
| Deliberate exclusions | Administration consumables are excluded outright, as are consumer accounts. Ask and we will tell you exactly what else we decline to carry, and why. |
| Who we sell to | Verified businesses only. Applications that fail verification are declined, not downgraded. |
| Published pricing | Every tier published for every SKU, before you apply. Quantities of 1,000+ are quoted. |
Common questions.
How do I verify a peptide certificate of analysis?
Check three things in order: that the document names a lot number rather than only a product, that the lot number matches the vial, and that you can confirm the lot through something other than the seller alone — a lot lookup you can reach, or the issuing laboratory. A certificate that fails the third check is a claim, not evidence.
What should a peptide CoA contain?
Identity by mass spectrometry, purity by HPLC reported as area-percent against a stated release specification, endotoxin by LAL, net content, the lot number, and the name of the laboratory that performed the work. Each value should sit next to the method that produced it.
Is a white-labelled certificate of analysis a red flag?
Not by itself — re-branding the header is routine when a reseller supplies under their own name. It becomes a red flag when the re-branding removes the originating laboratory, the lot number or the provenance line, because at that point nothing on the document can be traced back to the work it describes.
What minimum order should a wholesale peptide supplier require?
Minimums vary widely and a high one is not evidence of quality. What matters is whether the minimum lets you evaluate a compound before committing to volume. Ours is 10 vials, mix-and-match across the catalog, which is deliberately lower than the 50 to 100 vials commonly required.
How can I tell if a peptide supplier is legitimate?
Run the eight checks on this page against them. The useful ones are the checks that do not depend on the supplier being honest: whether the lot can be verified independently, whether the certificate names its laboratory, and what they refuse to sell. Marketing language, certificates without methods, and testimonials tell you nothing.
FOR LABORATORY RESEARCH USE ONLY. NOT FOR HUMAN OR VETERINARY USE. SOLD EXCLUSIVELY TO VERIFIED BUSINESSES.