The Importance of Third-Party Testing
Do not trust a label blindly. If a company grades its own work with in-house testing, the results are unreliable. You need Certificates of Analysis (COAs) from independent, third-party laboratories.
A valid COA must show the current lot number, testing date, and the independent lab's signature. Outdated logs are a major warning sign.
Understanding HPLC and Mass Spectrometry
High-Performance Liquid Chromatography (HPLC) separates the peptide from impurities. Look for a purity level of 98% or higher. Lower purity means residual chemicals are present, which can ruin study results.
Mass Spectrometry (MS) measures molecular weight. This confirms you received the actual compound you ordered, not a different substance.
Red Flags to Avoid
Avoid suppliers who hide their COAs, offer prices far below the market average, or only accept cryptocurrency without card protections. Trusted vendors like Amino Club keep their testing libraries fully public.