Reducing Redness & Inflammation with GHK Cu Copper Peptides Vitali Skincare Can You Use GHK Cu Peptides with Vitamin C Serum? Expert Guide STOP MIXING GHKcu!!!! Peptides are very fragile and combining them causes them to further degrade, reduce stability, and destabilizes purity. Differences in pH interact with each other and significantly decreas stability. Copper Peptide GHK CU, AHK CU Peptide Hair Growth Treatment Serum Dual Peptides eBay Neurogan Health, Copper Peptide GHK CU, 120 mcg, 60 Tablets iHerb