There are 72 patients in this study. They are randomly divided into 2 groups which are beta-glucan supplement group and placebo group. The supplement will be taken 1 capsule/day for 12 weeks. Forced expiratory volume in 1 second/Forced vital capacity, Modified Medical Research Council Dyspnea Score, Breathlessness, Cough, and Sputum Scale, 6 Minute Walk Test, Diffusing capacity for carbon monoxide, Tumor necrosis factor alpha, Interleukin-6, C-reactive protein, glutathione, aspartate transaminase, alanine transaminase, alkaline phosphatase, creatinine, and blood urea nitrogen are assessed before and after taking supplement 6 and 12 weeks.
