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 Can You Start with 100mg of Gck Cu TikTok Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum Amazon.com: GHK Cu Copper Peptide Supplement, Anti aging and revitalizing skin, strengthening hair roots: Precision nutrition capsules improve skin elasticity and increase hair density, 90 vegan capsules. : Health & Household Copper Peptides Serum for Face 2% GHK CU & 4% EGF Seraphime GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B