One of my patients has shared this picture with me as she felt it was odd that this peptide had this very vivid blue colour, while her other peptides had a clear 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 GHK cu INJECTOR PEN 3ML 50MG GHK Cu peptides are known for their powerful role in supporting beauty from within. They work on a cellular level to stimulate collagen production, helping to improve skin elasticity, reduce fine lines, and