Penguin Peptides scores 72/100 in pepmg's criteria-based Vendor Score, which rates only what a vendor publishes about lab testing and about itself, not its products and not its prices. What we observed: most COAs openable at the testing lab (47 of 80). The biggest credibility signal pepmg weighs is how a vendor publishes lab tests: the documents counted above open at the testing lab's own site (Janoshik), where the lab itself can confirm the result, and the rest are hosted by the vendor, where it cannot. Neither price nor catalog size affects this score, but for context it prices about 1.3x the tracked median across the compounds it shares with other tracked vendors, over 45 tracked listings. Its prices are machine-readable and it publishes a brief About page, and the domain has been online about 1.4 years. This rates what Penguin Peptides publishes about lab testing and about itself, not the purity or authenticity of any vial, which pepmg can't verify, so read the COAs yourself. Research use only.

• Strength Publishes COA documents, resolving to Janoshik — 80 COA documents found, 47 of them openable at the testing lab's own site

Are you the vendor? If you have changed something we score here, published something we did not find, or think we got it wrong, reach out or email hello@pepmg.com and we will re-check. Vendor corrections have already changed ratings on this site.