GHK Cu Peptide: What It Does for Body Composition and Metabolic Health Dr Tahera explains that the topical version of GHK Cu and how it supports skin repair and rejuvenation. This is the cream based approach. Injectables? We'll cover that next. Because understanding your options matters. The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Wellness peptide craze: why people are injecting drugs 'not for human consumption'