ghk cu hurts Peptide Therapy for Pain Management and Healing Why does Glycyl-Histidyl-Lysine-Copper (GHK-Cu) cause

Combinations with physical therapy for musculoskeletal injuries, with standard medical therapy for gastrointestinal conditions, or with other regenerative peptides such as growth hormone secretagogues could provide synergistic benefits

Comparative analysis found GHK-Cu improved collagen production in 70% of treated women, compared to 50% with vitamin C cream and 40% with retinoic acid

Thats my take on this paper

Since cysteine is known to be neurotoxic in excessive amounts [32], treatment with N-acetylcysteine should not be recommended for patients with glutathione synthetase deficiency as this may increase the intracellular cysteine levels even more