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N-Acetyl-L-Cysteine is an amino acid that may aid in the formation of glutathione, one of the body's most essential antioxidants.Cysteine is an amino acid, which serves as a building block for proteins and is found in every cell of the body. The supplement form of N-acetyl-L-cysteine is the most often used version of the amino acid (NAC). This is converted by the body into cysteine and subsequently glutathione, which is a potent antioxidant.