The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Injectable vs Topical GHK CU: Which Copper Peptide Form Works Best? Sama Says Fraley What's the difference between GHK Cu (copper peptide) as a topical cream vs an injection? In this video I break down: What GHK Cu is and why it's used in anti aging skincare What is the optimal dosing regimen of GHKCu for topical skincare and woundhealing applications?