Not all copper peptide serums are formulated the same Before you buy one, make sure you're actually getting pure GHK Cu at the right concentration not just a diluted blend. We spent GHK CU 1 Gram Copper Peptide Powder Cosmetic Face Hair 1 Grams Tube 2028 EXP eBay 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 Serum Peptides Intensive Serum Tripeptide 1 Ghk Cu Copper Peptide Acetyl Hexapeptide 8 Intensive Repair Reduces Wrinkle G 1% GHK CU Copper Tripeptide Serum w Hyaluronic Acid Niacinamide Is GHK Cu Legal? FDA Approved Peptides Neurogan Health