维生素类药，参与体内多种代谢过程，扩张 小动脉，用于防治粗皮病、烟酸缺乏症，也用作血管扩张及饲料、电镀业等。
Vitamin drugs, participate in a variety of metabolic processes in the body, dilated arterioles, used for prevention and treatment of crude skin disease, niacin deficiency, also used as vascular dilatation and feed, electroplating industry
