Ingredient guide
N-acetylcysteine, or NAC, is a form of the amino acid cysteine and a building block for glutathione, the body's main antioxidant. It is an established medicine for a few specific uses, with broader supplement claims at an earlier stage of evidence.
Moderate evidenceN-acetylcysteine, almost always shortened to NAC, is a modified form of the amino acid cysteine. Its claim to fame is that it is a direct building block for glutathione, the body's most important internal antioxidant. NAC has a long, respectable history in hospital medicine, which sets it apart from many supplements.
Cysteine is often the limiting ingredient the body needs to make glutathione. By supplying cysteine in a stable, absorbable form, NAC helps the body top up its glutathione, which mops up reactive molecules and supports detox pathways in the liver. NAC also helps break the bonds that make mucus thick and sticky.
For its established medical uses, the evidence is solid. NAC is a standard hospital treatment for paracetamol overdose and a recognised mucus thinner, including in some long-term lung conditions. These uses are well supported and clearly defined.
Beyond them, NAC is being explored for a long list of conditions, from fertility to mood to brain health, with mixed and mostly early results. A practical catch is absorption. Oral NAC is poorly absorbed, so low doses may do little. We grade the overall evidence as moderate, strong for its core medical roles and still developing for the broader supplement claims.
Supplement users typically take 600 mg to 1,800 mg per day, often split, with the lower end possibly too small to matter given poor absorption. Its medical uses are dosed and supervised differently. Because it can interact with nitrates and blood thinners and occasionally affects the airways, check with a healthcare provider before regular use.
Supplement doses commonly range from 600 mg to 1,800 mg per day, often split, with oral absorption low enough that doses under 1,200 mg may do little. Medical uses are dosed differently and supervised. Ask your healthcare provider before regular use, especially if you take nitrates or blood-thinning medicine.
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Yes. NAC supplies cysteine, often the limiting building block for glutathione, so it helps the body top up its main internal antioxidant.
Supplement doses are commonly 600 to 1,800 mg per day. Because oral NAC is poorly absorbed, doses under about 1,200 mg may have little effect.
It is generally well tolerated, though it can cause nausea and a sulphur smell. People on nitrates or blood thinners, or with asthma, should check with a provider first.