N-Acetyl-Cysteine (NAC) is derived from the amino acid L-cysteine. Amino acids the foundations of proteins and are essential in the bodies repair, growth and maintenance of tissue.  NAC Benefits L-Cysteine is found naturally in protein rich foods such as eggs and chicken.  Firma Vit N-Acetyl-Cysteine (NAC) is a high quality high strength N-Acetyl-Cysteine. NAC benefits from being vegan friendly.  2 Month Supply