Reputable Peptide Vendors: Who to Trust in 2026
68 of the 100 US vendors we track clear our third-party testing gate: an independent lab named on verifiable COAs. Ranked below on the same published formula, updated as new evidence comes in.
- Clear the gate
- 68
Clear the gate
- Total tracked
- 100
Total tracked
- COAs read and checked
- 1,686
COAs read and checked
Reputable vendors, ranked
Every vendor here has cleared the testing gate. Scores out of 10, live from current COA evidence.
- 🥇Zeptix Labs
8.17 / 10 · Strong · Accumark Labs, Freedom Diagnostics Testing
- 🥈Peptix USA
8.15 / 10 · Strong · ILS Laboratories, Freedom Diagnostics Testing
- 🥉Southern Aminos
8.09 / 10 · Strong · ILS Laboratories, Freedom Diagnostics Testing
- #4Amino Club
8.02 / 10 · Strong · ILS Laboratories
- #5DAAVY Research
8.01 / 10 · Strong · Bioviridian
- #6Transition Biotech
7.98 / 10 · Strong · Kovera Labs
- #7Prime Peptides
7.94 / 10 · Strong · Freedom Diagnostics Testing, Janoshik Analytical
- #8Luv Aminos
7.90 / 10 · Strong · Freedom Diagnostics Testing
- #9Modern Aminos
7.88 / 10 · Strong · Freedom Diagnostics Testing, Kovera Labs
- #10Pure Health Peptides
7.88 / 10 · Strong · Ethos Analytics Laboratory, BioRegen
- #11Ameano Peptides
7.80 / 10 · Strong · Janoshik Analytical
- #12Amino USA
7.78 / 10 · Strong · BioRegen, Freedom Diagnostics Testing
- #13S1Research
7.75 / 10 · Strong · Freedom Diagnostics Testing, ILS Laboratories
- #14LabFirst Peptides
7.73 / 10 · Strong · Kovera Labs
- #15Loti Labs
7.68 / 10 · Strong · Bioviridian, SR Biolabs
See the full ranked list, sub-scores, and filters on the complete vendor rankings →
Want our top picks across every category, gated or not? See the Best Peptide Sources.
“Shop” links may be affiliate links (rel="sponsored"); we may earn a commission. Affiliate status never affects any rating, rank, or gate. Disclosure.
Reputable Peptide Vendors: Frequently Asked Questions
What makes a peptide vendor reputable?
In our scoring, reputability is driven by verifiable third-party lab testing: an independent lab named on batch-specific COAs that we can cross-check, not just an in-house purity claim. The testing gate is computed from certificates (rule A9): a vendor carries it, and its score is capped, when fewer than half of its scored products have a certificate whose key we confirmed at the issuing laboratory, a laboratory in our directory that is not tier D. Being offline never sets the gate; a store that is not taking orders keeps the scores and gate from its last full audit (rule F1). They are listed with that note in the full rankings rather than on this page.
How many peptide vendors are actually reputable?
Of the 100 US vendors we track, 68 currently clear our third-party testing gate. The list below ranks them live on the same published formula.
Do affiliate partnerships affect who appears here?
No. Affiliate relationships are disclosed and never change a vendor's score, rank, or testing gate. Only vendors that clear the testing gate in the published formula appear on this page.