Best suppliers with public certificates of analysis
Every supplier here lets you open a certificate of analysis before you create an account or pay. For a first order it is the single most useful thing a storefront can offer, and it is the heaviest line in our formula.
Editorial rating, not user reviews. Stars are the weighted factor score divided by 20. Reference price = the supplier's listed price for BPC-157, 5 mg, where a like-for-like listing exists.
Why Core Peptides is our pick here
Core Peptides is rated 3.8 out of 5 overall: Quality 4.8, Trust 3.4, Value 3.2, Experience 3.8. US vendor (Orlando, FL) selling ~104 lyophilized peptides, blends and topical cosmetic peptides; no GLP-1 class products listed. Publishes per-lot COA PDFs from Vanguard Laboratory (HPLC-UV/VIS identity + purity; BPC-157 5mg lot C74112 reported >99.80% on 7/22/2026). Site says founded 2019 but peptideprotocolwiki.com lists 2023. Trustpilot profile has been removed by Trustpilot for guideline violations; no FDA warning letter found in search. BPC-157 5mg price inferred as the low end of the $52.00-$97.00 range on the 5mg/10mg variable product.
Questions buyers ask
Who is our pick for suppliers with public certificates of analysis?
Core Peptides, rated 3.8 out of 5, with Paramount Peptides next at 3.7. These are editorial ratings from our published formula, not user reviews.
How did these suppliers get on the list?
We filtered the full rated table by one fact that appears on each supplier's own pages. Nothing is re-weighted for the category; the stars are the same ones shown everywhere else on the site.
Can I buy these products for personal use?
Every supplier on this list sells materials labeled for laboratory research use only. We rate suppliers, documents and policies, and we do not describe or endorse any other use.