ghk-cu cream product Copper Peptide Barrier Lightweight organic copper peptide moisturizer with GHK Neurogan GHK-Cu Copper Peptide Face

That makes it one of the most-studied peptides in the entire preclinical (= preclinical testing prior to clinical trials) regenerative literature

Although there are no specific studies measuring the intratesticular testosterone and DHT levels in males who are homozygous for the 5-reductase-2 mutation, semen analyses of such patients with bilaterally descended testes suggest that DHT appears to be more important in regulating semen volume and viscosity rather than playing a major role in spermatogenesis (especially if normal testosterone concentrations are present) (39)

Human clinical trials of systemic GHK-Cu administration remain extremely limited, representing a critical knowledge gap requiring investigation before systemic therapeutic applications can be appropriately evaluated

Some have described it as being like a drill or an icepick in their brains