A colorless crystalline vitamin,C10H16N2O3S,of the vitamin B complex,essential for the activity of many enzyme systems and found in large quantities in liver,egg yolk,milk,and yeast.

• 生物素，无色结晶维生素，C10H16N2O3S，属复合维生素B，为多种酶系统活动必不可少的物质，并在肝、蛋黄、牛奶和酵母中发现大量该物质。