Showing 10 of 10 companies, ranked by our score.
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peptidesciences.com
Closed 6 March 2026. Peptide Sciences is not taking orders. It stays at the top of this list because for most of the past decade it was the answer to this question, and because people still search for it — but the first supplier on this page you can actually buy from is number two.
oathresearch.com
The highest-scoring supplier still trading: third-party tested, certificates with every order, a published refund for product that misses its stated purity, and a real address and phone number behind it.
sportstechnologylabs.com
The most complete public disclosure of any vendor here: a full street address, named third-party laboratories, a free-shipping threshold and a payment list, all on public pages.
corepeptides.com
The broadest openly browsable catalogue on this page — over a hundred peptides and blends, priced in the open, with a low free-shipping threshold and a seven-year trading claim.
particlepeptides.com
The most detailed testing disclosure we found anywhere in the category, and the only EU-based supplier here, with a registered company name and address on the page.
biotechpeptides.com
Posts its third-party results on its own site rather than sending them on request, and dates its own trading history — but publishes almost nothing about shipping or payment before checkout.
limitlesslifenootropics.com
Names the specific analyses behind its certificates and organises a ninety-compound catalogue by research area, but says nothing public about who or where the company is.
peptidepros.net
The lowest free-shipping threshold on this page and a catalogue that includes the diluents and kits most vendors leave you to source elsewhere, but the thinnest testing disclosure of any US vendor here.
polarispeptides.com
The only supplier here that names every card and wallet it accepts and publishes a toll-free phone number, and the only one that makes you create an account before you can see what it sells.
aminoclub.com
Reachable through aminos.com, which now redirects here. Almost nothing is public in front of the researcher verification gate, which is what its score measures.
Ten research peptide suppliers, ranked on the five things a buyer can check before spending anything: third-party testing and certificates of analysis, shipping, how much the company says about itself, how you reach support, and which payment methods are actually listed. Scores are ours, not a vote count.
Every supplier on this page was checked on the same five things, and all five are things you can verify yourself before you spend anything: whether third-party test results exist and can be reached, what the shipping policy actually commits to, how much the company says about itself in public, how you get hold of a human, and which payment methods are named before checkout.
That is a deliberately narrow set. It leaves out the two things buyers most want ranked — purity in the vial and whether an order arrives — because neither can be established from a website, and a review site that pretends otherwise is selling you a guess. What it does capture is disclosure, and disclosure is the best available proxy: a vendor that names its testing laboratory, its dispatch cutoff and its refund terms has committed to something you could hold it to.
A score below three on this page almost always means a vendor does not publish something, not that it does it badly. Two of the suppliers below sit at the bottom of the list purely because their public pages are a gate rather than a shop, and one of those has the best payment disclosure of anybody here.
The research-peptide category as a whole publishes very little. Street addresses are rare, founding years are rarer, and refund terms that survive contact with a bad batch are rarest of all. That is the context to read these numbers in. Everything sold by every company on this page is a research chemical, sold for laboratory use and not for human consumption, and every one of them says so on its own site.