Acetylcysteine (N-Acetylcysteine) is a mucolytic agent that can cross the blood-brain barrier, which reduces the thickness of the mucus. Acetylcysteine is a ROS inhibitor. Acetylcysteine is a cysteine precursor, prevents hemin-induced ferroptosis by neutralizing toxic lipids generated by arachidonate-dependent activity of 5-lipoxygenases. Acetylcysteine induces cell apoptosis. Acetylcysteine also has anti-influenza virus activities. In addition, Acetylcysteine is the most stable form of cysteine during drug delivery and can be used in disulfidptosis studies[1][2][3][4][5][6][7][8].