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 Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz Helloskin GHK Cu 1% Triple Peptide Regenerative Serum
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ghk-cu hair growth clinical study topical Amazon.com: Neurogan GHK-Cu Copper Peptide Hair & Scalp Serum – 2400mg, 4% Copper Peptides – Fast-Absorbing, Water-Based Formula for Hair Softness & Shine