Description Description: N-Acetyl-l-Cysteine (NAC) is an amino acid and antioxidant. It is a precursor in the body to the critical antioxidant glutathione, which is produced intracellularly, primarily by the liver. nac is significantly more cost effective than taking glutathione.Ingredient Details: N-Acetyl-L-Cysteine (a 100% natural antioxidant) 500 mgSuggested Use: Take 1 to 4 capsules per day, or as directed by your qualified health consultant.