exogenous glutathione exerts a therapeutic effect in ischemic stroke rats by interacting with intrastriatal dopamine and glycine Source Naturals, Reduced Glutathione Complex

Pairing glutathione with vitamin C enhances absorption and effectiveness

Some might (probably would*) be carcinogenic or outright poisonous

GHK-Cu is a synthetic copper peptide investigated in laboratory research involving peptide biology, molecular signaling, protein interactions, gene expression research, extracellular matrix biology, and analytical chemistry

Since its discovery back in 1973, its been a popular ingredient amongst hair and skin products because of all its regenerative benefits

Teskey G, et al

Glucagon-Like Peptide-1 and Hypothalamic Regulation of Satiation: Cognitive and Neural Insights from Human and Animal Studies