OneDay Compounds scores 39/100 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: COA documents, no lab named. The biggest credibility signal pepmg weighs is how a vendor publishes lab tests: pepmg catalogued COA documents on its site, but none of them open at a testing lab's own site and none name a lab pepmg could resolve, so a buyer can read the documents without being able to confirm them at the source. Neither price nor catalog size affects this score, but for context it prices below the tracked median across the compounds it shares with other tracked vendors, over 24 tracked listings. Its prices are machine-readable and it publishes a brief About page, and the domain is newer, online since Jan 2026, which pepmg counts as neutral rather than a mark against it. This rates what OneDay Compounds 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.

• Room to improve Publishes COA documents — no testing lab attributed — 100 COA documents found, 0 of them openable at the testing lab's own site

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