GHK Cu Side Effects, Complications, and Risk Profile GHK Cu Topical vs Injection Which is the Better Copper Peptide Form? 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 The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline
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