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They are classified as "essential" or "non-essential", with essential amino acids meaning they cannot be manufactured by the body and must be supplied in the diet to maintain good all-round health

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In laboratory research models, GSH exerts its antioxidant activity through direct scavenging of reactive oxygen species (ROS) and reactive nitrogen species (RNS), as well as through serving as an essential cofactor for glutathione peroxidase (GPx) enzymes, which catalyse the reduction of hydrogen peroxide and lipid hydroperoxides to non-toxic products

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