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