Research peptide suppliers are not interchangeable, and the differences rarely show on the homepage. Marketing claims are free; documentation is not. This checklist gives researchers a concrete, verifiable standard for evaluating any supplier — including us. Apply it to everyone.
1. Per-lot certificates of analysis — published, not promised
The single strongest signal. A trustworthy supplier publishes a certificate of analysis for each tested lot, openly, where anyone can read it before ordering — not a generic “COA available on request,” and not one certificate recycled across every batch forever. Check: can you find the certificate for a current lot of the product you intend to buy, right now, without emailing anyone? You can search ours by product name in the COA portal.
2. A named, independent laboratory
A certificate is only as credible as the laboratory that issued it. The lab should be identified by name on the certificate, be independent of the supplier, and ideally offer its own verification channel. An unsigned purity table with no lab name is a spreadsheet, not a certificate.
3. The original lab document, not a screenshot
Transcribed numbers can say anything. The supplier should attach the laboratory’s original PDF alongside any summary, so you can compare the two. Where a supplier shows only cropped images of results, ask why.
4. Purity claims that match the paperwork
If the homepage claims a purity standard, the published certificates should meet it. Spot-check: pick two products, open their certificates, compare the chromatographic purity to the sitewide claim. Consistency here predicts consistency everywhere else.
5. Straight research-use positioning
A legitimate research supplier states plainly that its compounds are for laboratory research only and makes no clinical claims. Dosing guides, testimonial photos, and health promises are signs a vendor is inviting regulatory trouble — trouble that can take your source down with it mid-study.
6. Traceable business identity
A registered legal entity, a physical US address, a working phone number, and a responsive support inbox. Suppliers that exist only as a checkout page tend to exit the market as quickly as they entered it — often with open orders.
7. Sane logistics
Same-day or next-day dispatch, tracking on every order, cold-chain awareness for temperature-sensitive compounds, and stock status that reflects reality. A supplier that oversells inventory it does not hold introduces delays your research timeline pays for.
Red flags worth taking seriously
- No certificates, expired certificates, or one certificate reused across all lots
- Purity claimed in marketing but absent from any document
- Prices dramatically below the market — peptide synthesis has real costs, and a too-good price is usually subsidized by purity
- Health claims or dosing instructions on a “research” storefront
- No reachable human behind the site
The one-minute version
Open the supplier’s certificate for the exact product and lot you intend to order. If you cannot find one, or the lab is unnamed, or the numbers do not match the marketing — keep looking. Documentation you can verify beats claims you have to trust.
All compounds discussed on this site are for laboratory research use only and are not for human consumption.