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Dihexa, a small peptide derivative of angiotensin IV, acts as a potent HGF (hepatocyte growth factor) mimetic and has demonstrated cognitive enhancement in rodent models at nanomolar concentrations

in the synthesis of essential fats, cholesterol, steroid hormones, vitamins A and D, the neurotransmitter acetylcholine

The FDA has determined that NAC is excluded from the statutory definition of a dietary supplement under the Federal Food, Drug, and Cosmetic Act, because NAC was authorized as an active pharmaceutical ingredient (for acetaminophen overdose) before it was widely marketed as a supplement

Fu Y, Liu S, Zeng S, Shen H