journal.html Research notes, methods and quality explainers. Research use only. journal-how-to-read-a-coa.html sb-journal-how-to-read-a-coa 2026-10-16T00:00:00Z A certificate of analysis is a claim sheet, not a guarantee. Here is what HPLC area%, mass spec identity, endotoxin and sterility lines each do and do not establish — and which questions to ask when a line is missing. journal-hplc-purity-limits.html sb-journal-hplc-purity-limits 2026-10-16T00:00:00Z Area percent is the most quoted and least understood number on a peptide certificate. A short methods note on detection thresholds, co-elution, and why two labs can honestly report different purity for the same vial. journal-bpc-157-evidence-state.html sb-journal-bpc-157-evidence-state 2026-10-16T00:00:00Z A pentadecapeptide derived from a gastric juice protein, with a large rodent literature and a thin clinical one. A neutral map of where the evidence stands, what models dominate it, and where the gaps are. journal-batch-traceability.html sb-journal-batch-traceability 2026-10-16T00:00:00Z The cheapest signal of a serious supplier is not price or purity number — it is whether a certificate can be tied to the exact unit you received. How to test traceability before you buy.