Acetylcysteine, also known as NAC, is a medication and dietary supplement that is frequently used for medical treatments. It is derived from the amino acid L-cysteine. NAC plays a significant role in treating conditions like paracetamol overdose, cystic fibrosis, and chronic obstructive lung disease, among others. With its powerful antioxidant properties, Acetylcysteine supports immune health and promotes overall wellness.