Turn Back the Clock: The Science Backed Anti Aging Stack You Need Now Advanced Vitality 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 Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference Cu Peptide Before and After: What to Expect for Skin and Hair