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 Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum Peptide GHK CU Cream Concierge MD
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