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Schiavone S, Jaquet V, Trabace L, and Krause K

The amount of copper delivered by typical research-peptide GHK-Cu doses is small relative to dietary copper and total body copper, and there is no published evidence of copper toxicity from GHK-Cu at the doses discussed in the peptide community

Abstract The glutathione (GSH) system is considered to be one of the most powerful endogenous antioxidant systems in the cardiovascular system due to its key contribution to detoxifying xenobiotics and scavenging overreactive oxygen species (ROS)

This is an extremely interesting and novel finding as cutaneous aging is a significant problem faced by the majority of people of any age