niacin
noun [ U ] chemistry, biology specialized uk/ˈnaɪə.sɪn/ us/ˈnaɪə.sɪn/
烟酸（在小麦、牛肉、鸡肉和牛奶等食品中含有的一种复合维生素B，对体内能量转化和保持消化、神经系统健康有着重要作用）
one of the vitamin B complex found in foods such as wheat, beef, chicken, and milk, important for producing energy from food and for keeping the digestion and nervous system healthy