Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3 Dr. Brenner Labs 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. Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with You are wasting your peptides if you are mixing them with GHK cu., Lets not even talk about all the the blend pens being sold., Even Peptide companies are selling GHK cu Blends. They damage the other