Cohort · 2024
Identity and Purity Testing of Consumer-Marketed Research Peptides
Independent laboratory analyses · Analytical toxicology literature (multiple analyses)
Mass-spectrometry surveys of grey-market peptide vials repeatedly find under-dosing, wrong sequences, bacterial endotoxin, and undeclared excipients in a substantial share of samples.
Key findings
- Label-claim deviation is common across vendors
- Endotoxin contamination found in non-sterile preparations
- Third-party COAs are frequently unverifiable or reused
Limitations
Sampling is non-random and vendor-specific; findings should not be extrapolated to any individual seller.