Peptide Press — BriefingEditorial coverage of peptide research, analytical testing, clinical studies, and regulation.https://peptide.press/en-usHow to read a peptide Certificate of Analysishttps://peptide.press/articles/how-to-read-a-peptide-certificate-of-analysis/https://peptide.press/articles/how-to-read-a-peptide-certificate-of-analysis/Identity, purity, potency, net content — what each line on a COA actually proves, walked through on a real report, and the gaps a clean-looking document can still hide.Sat, 11 Jul 2026 00:00:00 GMTtestingCOAHPLCpuritynet contentquality controlWhy a 99% purity result doesn't tell you what buyers think it doeshttps://peptide.press/articles/why-a-99-percent-purity-result-can-mislead/https://peptide.press/articles/why-a-99-percent-purity-result-can-mislead/Purity and net content answer different questions. Conflating them is the single most common way a technically honest COA leaves a buyer worse off.Wed, 08 Jul 2026 00:00:00 GMTtestingpuritynet contentCOAquality controlWhy promising peptide results in mice so often fail to translate to humanshttps://peptide.press/articles/why-mouse-results-fail-to-translate/https://peptide.press/articles/why-mouse-results-fail-to-translate/Preclinical data is where most of the excitement in the peptide world originates — and where most of it should be tempered. A field guide to reading animal studies with the skepticism they deserve.Sun, 05 Jul 2026 00:00:00 GMTresearchpreclinicaltranslationstudy designresearch literacyWhat the March 2026 FDA warning letters reveal about the limits of "research use only"https://peptide.press/articles/march-2026-fda-peptide-warning-letters/https://peptide.press/articles/march-2026-fda-peptide-warning-letters/In a single day, the FDA told multiple peptide sellers that an RUO label does not control when the surrounding evidence establishes an intended human-drug use. The reasoning is worth reading closely.Thu, 02 Jul 2026 00:00:00 GMTregulationFDAenforcementRUOwarning lettersintended useHow to check a compound's clinical trial status yourselfhttps://peptide.press/articles/reading-clinicaltrials-gov-status/https://peptide.press/articles/reading-clinicaltrials-gov-status/ClinicalTrials.gov is public, free, and the fastest way to separate a compound with real human data behind it from one riding on preclinical hype. Here's how to read a record.Sun, 28 Jun 2026 00:00:00 GMTtrialsclinical trialsClinicalTrials.govresearch literacyphases