Thrive Copper Peptide Serum Skin Barrier Support & Hydration 29ml GHK Cu is one of my personal favorites for a lot of reasons, but I can say without a doubt that it's use effectively stopped and reversed, my receiving hairline. However, there are 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 Buy GHK Cu Peptide Serum Research Serum for Anti Aging Dimeric copper peptide incorporated hydrogel for promoting diabetic wound healing Nature Communications Amazon.com: Copper Peptides GHK Cu Hydra Serum with Hyaluronic Acid Facial Serum for Tightening, Collagen Support, Renewing, Elasticity & Smooth Youthful Looking Skin (30ml 1fl.oz) : Beauty & Personal Care