GHK-Cu, the copper-binding peptide with the most research behind it, targets oxidative damage and pigment gene expression
doi: 10.1007/s12603-018-1086-5 18
the published abstract describes this as a safety signal affecting a limited number of patients without a documented breakdown of exact case counts
Also, there is growing concern regarding concussion-induced cortical damage seen in children and young adults who participate in American football (chronic traumatic encephalopathy), boxing, martial arts, and soccer (due to headers) [35,36]
Well teach you the proper technique during your consultation
Third-party COAs are your first line of verification, but they only confirm the tested batch, not the specific vial that arrived at your lab