The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK Cu Peptide: What It Does for Body Composition and Metabolic Health The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline This peptide reverses aging, And its been hiding in plain sight for decades., GHK Cu (Copper Peptide) is one of the most researched anti aging ingredients out there., Heres what it does:,