glutathione and dopamine o-quinone GSH conjugation catalyzed by transferase Glutathione Is Involved in the

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10.1126/science.1073308 190 WhistlerJ

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Unlike the results found in previous studies, the effect of high dose N -acetylcysteine on air trapping and airway resistance of chronic obstructive pulmonary disease, a double-blinded, randomized, placebo-controlled trial (HIACE) conducted with 120 patients with stable COPD (58 treated with 600 mg of oral NAC twice a day and 62 with placebo), demonstrated a significant improvement in the function of the small airways, in addition to a reduction in the frequency of exacerbation of the disease [53]

In studies lasting 68 weeks, participants taking 412mg daily sometimes showed improved endurance, higher time-to-exhaustion scores, or smaller increases in creatine kinase an enzyme that rises with muscle damage.32 Not all trials find performance benefits, but those that do often include participants with lower baseline antioxidant intake or higher training loads.33 For now, researchers interpret the findings as preliminary evidence that astaxanthin may support recovery in situations where oxidative stress is high.38 Sleep and fatigue Researchers have begun exploring how carotenoid intake might relate to sleep quality