Best Peptide Vendors 2026 — PeptideExaminer

How We Rate Vendors

Transparency COA availability, company info, manufacturing details

Testing Third-party verification, testing frequency, lab accreditation

Pricing Value relative to quality, price transparency, no bait-and-switch

Compliance FDA warning letters, legal claims, regulatory history

B or Higher

These vendors meet our standards for transparency and testing. We have varying degrees of confidence in each, reflected in their individual grades.

Vendor	Grade	Transparency	Testing	Pricing	Compliance	COA	3rd Party
Science.bio (Closed)	A-	95	90	70	40	✓	✓	View →
Peptide Partners	B+	80	90	55	65	✓	✓	View →
Eternal Peptides	B	70	80	55	60	✓	✓	View →
Verified Peptides	B	75	75	55	60	✓	✓	View →

B- to C

These vendors have some transparency or testing gaps. Usable, but verify individual product COAs and research recent community feedback.

Vendor	Grade	Transparency	Testing	Pricing	Compliance	COA	3rd Party
Peptide Sciences	B-	50	65	55	50	✓	✓	View →
ProHealth Longevity	B-	70	65	60	80	✓	✓	View →
Trident Peptides	B-	55	50	60	55	✓	✓	View →
Infiniwell	C+	45	50	30	50	✗	✓	View →
Integrative Peptides	C+	40	55	35	45	✗	✓	View →
Paradigm Peptides	C+	45	60	50	55	✗	✓	View →
Swisschems	C+	50	55	75	40	✓	✓	View →
Core Peptides	C	50	45	55	50	✓	✗	View →
Limitless Life Nootropics	C	45	50	55	45	✓	✓	View →

C- or Lower

Significant concerns about transparency, testing, or compliance. Consider alternatives unless you have specific reasons to proceed.

Vendor	Grade	Transparency	Testing	Pricing	Compliance	COA	3rd Party
Prime Peptides	C-	50	55	55	25	✓	✓	View →
Strate Labs	C-	50	60	70	20	✓	✓	View →
LVLUP Health	D+	40	45	50	35	✗	✗	View →