Key answer
Peptide stability is a system question involving identity, matrix, pH, oxygen, light, hold time, drying, residual moisture and packaging.
Start with identity and specification
Confirm the exact peptide, counterion, purity basis, water content and supplier documentation. Trade blends and similarly named peptides are not interchangeable.
Map process exposure
Record mixing sequence, pH, shear, temperature, hold times, drying profile and environmental humidity. Evaluate the finished patch rather than inferring recovery from raw material alone.
Control moisture and oxygen
Residual moisture can change array mechanics and degradation risk. Pair process controls with a justified barrier pouch, seal window and storage statement.
Use decision-linked tests
Choose methods that answer identity, content, degradation, appearance and release questions for the actual project.