NAC

NAC, or N-acetylcysteine, is a cysteine derivative. It can provide a precursor to glutathione, an important molecule in the antioxidant defenses of cells. It is also a substance used as a medicine to thin certain bronchial secretions and as an antidote in paracetamol poisoning. These specific uses do not demonstrate automatic benefit as a daily supplement.

To improve appearance or concentration in a healthy adult, evidence remains insufficient. Research suggests an interest in certain compulsive and effort-related behaviors, with varying results. The NAC therefore remains a secondary option, to be considered for a specific objective. It does not replace sleep, a suitable diet, or support when a disorder is present.