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N-Acetyl L-Cysteine (NAC) is a derivative of the amino acid L-Cysteine which is found in most high-protein foods and is known to possess anti-inflammatory, antioxidant, respiratory and neuroprotective properties. N-Acetyl L-Cysteine (NAC) is the supplement form of the amino acid cysteine which is found in most high-protein foods, such as chicken, turkey, yogurt, cheese, eggs, sunflower seeds, legumes and onion. The compound facilitates essential biological functions by bonding with two other amino acids—glutamine and glycine—to create a powerful antioxidant known as glutathione. NAC, being a precursor to glutathione have been found to bind to the glutamate recognition site of the NMDA and AMPA receptors and may act as endogenous neuromodulators. Clinical studies suggest that NAC possesses anti-inflammatory, antioxidant, respiratory and neuroprotective properties.