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NAC itself is a supplement form, but you can get the amino acid cysteine from high-protein foods like poultry, eggs, garlic, and onions

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Constipation can build more slowly and persist as stomach and intestinal movement slows

Supplements Glutathione Glutathione is one of the most direct alternatives to NAC because NAC is often taken specifically to increase glutathione levels.10 Rather than supplying a precursor, glutathione supplements provide the antioxidant itself

Some fortified foods, dietary supplements, and medications contain a synthetic version of vitamin B12