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 GHK Cu Skin Cream Proven Collagen & Anti Aging, $279 Amazon.com: Copper Peptide Hair Serum with Copper Tripeptide 1 Dual Peptide Scalp Treatment plus Licorice Root Extract : Beauty & Personal Care Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum GHK Cu Facial Serum Empower Pharmacy Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience
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ghk-cu hair growth clinical trial topical Amazon.com : Truth Guy GHK-CU Anti-Aging Copper Peptide Serum for Skin & Hair Growth, with Carbon-60 for Fuller Hair, Beard and Lashes