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 Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum GHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair 12 Week Supply (30 mL) GHK Cu Hair Growth Serum Proven Copper Peptide, $299 Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum
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ghk-cu hair growth clinical study topical GHK-Cu Hair Growth Serum