Independent lab testing renews scrutiny of research-peptide purity
Independent third-party lab analyses circulating in 2026 report that a substantial share of online research peptides fail to match their stated purity, with occasional findings of sub-90% purity and contaminants. A recurring technical point: a peptide can test around 99% pure and still carry endotoxin levels that matter for cell-culture and animal work (a common injectable-grade reference is below 5 EU/mg). The findings underline why a Certificate of Analysis — purity %, method, and endotoxin — is worth reading closely.
Sources: Peptide purity testing methods; independent lab investigation.
For informational use only — not medical advice. 21+.