The vendors we trust for research peptides — third-party tested, established, and responsive — with exclusive discount codes for Peptide Assistant readers.
Disclosure: some links on this page are referral links — if you buy through them or use our discount codes, Peptide Assistant may earn a commission at no extra cost to you. That never changes who appears here: vendors are listed because they meet the criteria below, not because they pay to be listed.
Our top pick: four years in business with third-party testing on their catalog, 90+ peptides with many size and blend variants, live chat staffed seven days a week, and two-day shipping.
Independent lab verification (COAs) of purity and identity — not just in-house claims.
Years in business and a consistent reputation. New storefronts churn; established vendors have something to lose.
A wide, well-stocked range of peptides and size variants — a sign of real supply chains, not drop-shipping.
Reachable humans when an order goes sideways, and fast, properly-packaged shipping.
Track doses, schedules, and vials with the free end-to-end encrypted tracker — or compare current costs on the peptide prices page.
Start tracking freePeptide Assistant does not sell peptides and does not provide medical advice. Products sold by the vendors above are for research purposes; review your local regulations before purchasing. Always consult your healthcare provider.