GHK Cu Blue Copper Peptide + Betaine Serum Wonderlini exquisite skincare Copper Peptide Serum for Dull & Mature Skin VALNCIA 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 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