NAD+ and GHK Cu aren't interchangeable! They're complementary One restores what's happening beneath the surface: cellular energy, mental clarity, vitality that lasts beyond a caffeine rush. The other rebuilds what you see: The Ultimate Human Shop Peptual BPC 157, NAD+, GHK CU Patch AGELYTIX NMN NAD GHK CU Topical GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? 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