Skin Perfection GHK Cu Copper Peptide Serum Booster, 1 Percent Blue Liquid For Face, Neck, Body, Hair, And Scalp, 0.5 oz Walmart.com Peptides are powerful. From GHK Cu to Retatrutide, NAD+, Melanotan II, and Thymosin Alpha 1 each one works through completely different pathways and can have very different effects on the body. Before Retatrutide Pen Custom GHK CU Infiniwell PSA] Albeit rare Copper peptide "uglies" are real and scary. Case report and looking for advices : r SkincareAddiction