Amazon.com: Skin Perfection GHK Cu Copper Peptide Powder 99.7% Pure DIY Copper Peptides Serum for Face and Scalp Cosmetic Grade GHK Cu 1 Gram Creates Up to 100ml for Fuller Hair and Transform Your Skin with GHK Cu Benefits Understanding the Concentration: Why 3% GHK CU is the Sweet Spot for S Aseir Custom Just started GHK Cu? Here's what to expect This isn't an overnight peptide, it builds Weeks 12: You may start noticing small shiftsskin feels a bit smoother, nails a little stronger Weeks 34: If youre using GHK Cu and it stings a little (which is common) this ones for you , In this reel Im sharing the small tweaks that have helped me make peptide injections way more comfortable