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Checked October 19, 2026 · updated weekly

All 125 peptide vendors we've checked

Every US research peptide store we track, with the testing evidence you can verify yourself: which labs they use, whether they publish COAs, how many independent Finnrick tests exist and what they charge.

  • 125vendors tracked
  • 91publish COAs
  • 49with Finnrick tests
  • 27peptides priced
See our top 10Browse all 125

Our editors' top 10

How we rank
  1. #1

    American Peptides

    Looking up a COA by vial lot number

    9.1/10

    ReviewVisit
  2. #2

    NextGenPeps

    COAs with named labs and endotoxin data

    8.8/10

    ReviewVisit
  3. #3

    PSPeptides

    Payment flexibility and fast US shipping

    8.5/10

    Code CHECKED

    ReviewVisit
  1. #4Blank Peptides7.8
  2. #5Ascension Peptides8.1
  3. #6Peptide Plugs7.5
  4. #7Peptide Confidential7.6
  5. #8Swiss Chems6.5
  6. #9Licensed Peptides7.4
  7. #10Alpha Pro Peptides6.3

The full directory

Search, sort or filter all 125 vendors

Research use only. The compounds referenced on this page are sold for laboratory research purposes only. They are not drugs, foods, cosmetics or dietary supplements, and they are not approved by the FDA for human or veterinary use. Nothing on this page is medical advice. PeptideChecked does not sell peptides, does not provide dosing guidance, and does not recommend the use of any compound in humans.

FAQ

About this directory

How is the vendor score calculated?

The same formula for every vendor outside our editors' top 10: testing evidence 50% (COAs published, matched to lot numbers, lab named, endotoxin and sterility testing), independent data 20% (Finnrick tests and rating), transparency 20% (address or company named, shipping and refund terms, card payments) and track record 10%. Each red flag, such as human dosing guides or an FDA warning letter, costs a point.

Why are some vendors ranked and others not?

Our top 10 is an editors' list based on a deeper review of each vendor. Every other vendor here was checked against the same public evidence and scored with the formula above, so you can compare them.

Do vendors pay to be listed?

No. Some vendors pay us a commission when you buy through our links, which is disclosed on every page. Being a partner never changes a score or a price ranking.

How do you find vendors?

From independent test data (Finnrick), reader requests, search demand and other vendor lists. We only list stores we could open and that were taking orders when we checked.