GHK Cu (copper peptide) is a science backed anti aging compound that supports collagen production, skin regeneration, and overall skin health. Used in both topical serums and subcutaneous GHK Cu GenScript GHK Cu Peptide Therapy Topical Cream GHK CU Infused Grass Fed Beef Tallow Rejuvenating Moisturizer Etsy Rigid flexible nanocarriers loaded with active peptides for antioxidant and anti inflammatory applications in skin ScienceDirect