Skincare Copper Peptide GHk Cu & Methylene Blue Global Ubuy Skin Perfection Ghk Cu Copper Peptide Powder 99.7% Pure Diy Ghk Powder to Make a Serum for Face Hair Scalp 1g 99% Pure Copper Peptides (ghk cu) Great for DIY 1 Gram Etsy Not all Copper Peptides are created equal If you've tried copper peptides before and saw no change, here is why: Concentration and Stability. Most serums use a diluted solution that barely scratches