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N-Acetyl L-Cysteine 600 mg Per ServingDietary Supplement Third Party Tested Gluten Free Certified Vegan cGMP Certified BPA Free Feel The Difference GuaranteeCysteine is a semi-essential amino acid. Cysteine is found in most high protein foods such as chicken turkey yogurt cheese eggs sunflower seeds and legumes. N-Acetyl L-Cysteine (NAC) is a supplement form of cysteine. NAC is an immediate precursor to a very precious substance that our body makes called glutathione which is an antioxidant.