== Home remedies ==
In patients with stable, moderate-to-severe chronic obstructive pulmonary disease (COPD), [[N-acetyl Cysteine]] may help improve physical performance. For a 2009 study published in the journal Chest, 24 COPD patients took either N-acetylcysteine or a placebo daily for six weeks. After taking a two-break (in order to eliminate N-acetylcysteine from the bodies of participants in the treatment group), the study participants were switched over to the alternate therapy for an additional six weeks. Study results indicated that N-acetylcysteine helped improve several markers of respiratory health, such as lung capacity and exercise endurance.
== Warnings ==