Azentra GHK Cu Research Peptide Azentra Research Labs 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 50mg Peptide Pen Reviva+ Peptides Ghk cu pen Pharmaco.shop UAE 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