N-acetyl L-cysteine, often shortened to NAC, is an acetylated form of the amino acid L-cysteine. The modification makes it a distinct compound rather than simply another name for cysteine.
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NAC can supply cysteine used by the body to make glutathione, an important part of cellular antioxidant systems. That biochemical role does not mean a supplement is proven to prevent or treat a disease.
Measure and mix NAC powder only as directed on the product label. Keep the container tightly closed, follow the labeled storage conditions, and contact the manufacturer if the seal is damaged or the product changes unexpectedly.