GHK Copper Peptide GHK Cu Tripeptide 1 GHK Cu 1% Kupfer Peptide Serum Straffung & Regeneration 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 30 Count Soothe
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