Cu Peptide Before and After: What to Expect for Skin and Hair GHK Cu Copper Peptides Medical Grade Anti Aging Cream by UluRx 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 Ghk cu results so far! This is only 3 weeks of using ghk cu 1 mg 5 days a week, also she added it to her tallow cream that she use