Not all copper peptide serums are formulated the same Before you buy one, make sure you're actually getting pure GHK Cu at the right concentration not just a diluted blend. We spent GHK CU 50mg Vial Copper Peptide Pure Bio Labs Pure Ghk cu & Ahk cu Powder 99% High Purity Copper Tripeptide, DIY Cosmetic Ingredient Etsy Skin Perfection Ghk Cu Copper Peptide Powder 99.7% Pure Diy Ghk Powder to Make a Serum for Face Hair Scalp 1g GHK Cu Hair Growth Spray Strengthen & Revitalize Hair Pure Tides Therapy