N-acetylcysteine, also known as NAC, is the supplement form of the non-essential amino acid L-cysteine. In its natural form, cysteine is found in foods including meat (pork, beef), poultry (chicken, eggs), fish (tuna), dairy (yogurt, swiss cheese) and seeds (sunflower). Cysteine is a component of the powerful antioxidant, glutathione, and is used for its liver-protective properties and immune function support, as well as, in the treatment of an acetaminophen overdose.
Oxidative stress is a main factor of COPD, N-Acetyl Cysteine may help due to its antioxidant and mucus-clearing properties, specifically as an adjunct therapy.
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