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GHK-Cu (Copper Peptide), a naturally occurring peptide composed of three amino acids (glycyl-L-histidyl-L-lysine), has been extensively studied for its potential in wound healing, tissue regeneration, and skin rejuvenation

The first nootropic to use the term was a drug developed in the 1960s called piracetam.60 61 It was intended to treat anxiety and provide patients with a soothing experience that might even lull them to sleep.2 The effect was quite different than what its creators intended, as users reported sharper focus, and later testing pointed toward improved memory

Superoxide dismutase as major enzyme protectant against oxygen toxicity

10.1074/jbc.M114.602284 J

If you want a closer look at the nutrient itself, see What Does a Glutathione Supplement Do