If you are using retinol? Add this to your routine! TikTok Everything you need to know about GHK Cu WHAT IS IT? A copper peptide your body naturally produces but production drops by 60% by age 60. It's one of the most superPeptide 1% GHK Copper Peptide Serum Pure & Cimple Copper Peptides for Skin: What GHK Cu Does and How It Compares to Retinol I was super skeptical because I've literally tried everything Retinol destroyed my skin. Vitamin C oxidized and stung. Four different peptide serums and nothing actually worked. Then I tried GHK Cu. 6 weeks