US research-peptide supplier — "Real Science. Real Standards." — with independent third-party HPLC testing on every batch, ≥99% purity, and COAs searchable by product or batch number.
The Standard
Independently documentedParamount Peptides scores 70 of 100 on our Standard, placing it in the Independently documented tier. US research-peptide supplier — "Real Science. Real Standards." — with independent third-party HPLC testing on every batch, ≥99% purity, and COAs searchable by product or batch number.
Ships FedEx 2Day to the US and Puerto Rico only. Independent testing is stated but the lab is not named on the public pages; verify the COA for your batch number before use.
Every point is earned from a transparency signal Paramount Peptides publishes — weighted by what actually protects a researcher. A vendor cannot buy a better score; the Standard is the same for everyone.
Reship on loss· not published
A published policy for a package that arrives damaged or never arrives at all — the recourse that matters most when something goes wrong in transit.
Refund policy
A stated money-back or returns policy you can actually hold them to, rather than an order that is final the moment it ships.
Independent testing
HPLC and mass spec run by an outside lab (Janoshik, MZ Biolabs) — not an in-house bench grading its own homework.
COA on file
A certificate of analysis you can actually pull for the product — the paperwork, not a promise.
Per-batch, lot-matched
Every batch tested and the certificate matched to your specific lot — not one reference batch reused forever.
Visit Paramount Peptides
You leave AmericanPeptide for the vendor’s own site. Always request and match the third-party COA for your specific lot before any use.
Go to Paramount PeptidesAffiliate disclosure. AmericanPeptide does not sell peptides. This is an independent third-party vendor, and we may earn a commission if you register or buy through this link — at no extra cost to you. Listing and ranking are based on published transparency signals, never on commission; where a card is labeled “Featured partner,” that placement is paid, and it buys position rather than a better score.
A broad research-peptide catalog — Paramount Peptides stocks the mainstream research-peptide market rather than a short list. Browse the catalog to look up any compound, or see it ranked against other suppliers on the directory.