ghk-cu side effects human studies may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes GHK-Cu Peptide Therapy: The Definitive
Description
Here are the practical details that matter

Use regularly every day for at least 8 weeks to gain full benefits

However, the translation from rodent research to human outcomes is not guaranteed, and no large randomized controlled trials in humans have been published
Annu Rev Pharmacol Toxicol 18:5779 Gomez-Sintes R, Bortolozzi A, Artigas F, Lucas JJ (2014) Reduced striatal dopamine DA D2 receptor function in dominant-negative GSK-3 transgenic mice

Speak with a healthcare provider before beginning treatment
