The continuous temperature-controlled supply chain required to maintain peptide stability from manufacture through storage to use. Most reconstituted peptides require refrigeration at 2–8°C (35–46°F). Lyophilized (freeze-dried) peptides are more temperature-tolerant but still degrade faster at room temperature or above.

Cold chain integrity is a significant quality concern in the research peptide market. Unlike pharmaceutical supply chains with validated cold shipping, research chemical vendors vary widely in their shipping practices. Peptides exposed to heat during transit may arrive partially degraded—and degradation is invisible without analytical testing. This is one reason why certificate of analysis documentation and vendor reputation matter for research quality.