GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK Glow Peptide Protocol GHK Cu, BPC 157, TB 500 Neurogan Health GHK Cu, the copper peptide, is a game changing injectable for radiant skin and so much more Here's what it can do: Boost collagen for smoother, firmer skin Anti aging