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 Dermatologist TestedGHK CU Copper Peptide Serum for Hair Growth Thicker Fuller Hair in 8 Weeks Scalp Essence for Stronger Roots USA Design TikTok Shop GHK cu 3% Serum Copper Peptide GHK Copper Peptide Concentrate, cumpr ingredient cosmetic GHK CU 50mg Vial Copper Peptide Pure Bio Labs