Is a degraded peptide the same thing as a contaminated one?
Updated: 2026-09-09 · Buying, quality and COA
Short answer
No. Degradation means the molecule itself has broken down or changed with time, heat or moisture. Contamination means something is present that should not be: solvents, process materials, microorganisms or endotoxins. Different tests detect them, and a document may cover one and not the other.
In plain English
- A product can be pure with respect to what is declared and still have degraded afterwards.
- Chromatographic purity testing does not assess microbiological contamination.
- Degradation depends heavily on how the product was shipped and stored.
- A COA describes the material at the time of analysis, not at the time it reaches you.
What we know
- Peptide products undergo separate tests for content, related impurities and contaminants.
- Temperature, light and moisture are known drivers of peptide degradation.
What we don't know yet
- Without testing the lot you received, its current state is unknown.
- Visual inspection rules out neither partial degradation nor contamination.