Topical or SubQ GHK Cu? Same molecule. Very different purposes. Topical you apply it on your skin. Think of it as feeding your skin from the outside. In a 12 week study of Injectable Peptides vs Neurotoxins Raleigh NC GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution Can You Use GHK Cu Peptides with Vitamin C Serum? Expert Guide
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