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 Amazon.com: Copper Peptide Hair Serum with Copper Tripeptide 1 Dual Peptide Scalp Treatment plus Licorice Root Extract : Beauty & Personal Care GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care GHK Cu: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration Shed Copper Peptide Hair Growth Serum Take an Rx approach to hair health
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