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 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 Amazon.com : AzulBotanicals Copper Peptide GHk Cu & Methylene Blue Infused Shea Butter Balm Vegan Face & Body Moisturizer for All Skin Types With Organic Ingredients 1.7 oz : Beauty & Personal Care Private Label Blue Copper Peptide Serum Skin Care Solution Ghk cu Serum for Anti Wrinkle and Moisturizing Alibaba.com 7% GHK Cu Cosmetic Ingredient Accelerant Skin Biology 15 ml MorNatural