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 vs NAD+: Which Longevity Peptide Should You Take or Stack? How should a 50 mg vial of GHKCu be reconstituted and how many days will it last when given at 2 mg daily for five days with a twoday break? I didnt expect much when I started using GHK Cu but after 6 months, I get it., Heres what Ive noticed:, My skin feels tighter and smoother, That crepey look? Way less noticeable, Fine