GHK Cu is one of the most powerful regenerative peptides for skin, hair, and overall tissue health. GHK Cu supports collagen production, healing, and visible rejuvenation from within. It's commonly used to improve skin Copper, Collagen, and Controversy: Inside the GHK Cu Buzz Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with Pptido de cobre GHK GHK Cu Tripptido 1 I ran GHK Cu for 12 months so you dont have to (here are the results)