Sent GLOW, KLOW, and the TB BPC blend to a lab after 30 days refrigerated., 99.6% purity before. 99.6% purity after., Same milligram content. No measurable degradation., These blends are Glow Peptide Protocol GHK Cu, BPC 157, TB 500 Neurogan Health Most Powerful Peptide for Muscle Building and Physical Performance (Mitochondria Enhancer) A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend Experience KLOW Peptide Results in Just 2 Weeks