a B vitamin (= one of a group of natural substances necessary for good health) found in foods such as eggs, liver (= an animal organ), and yeast (= a fungus that makes bread rise). It helps the body use fats and carbohydrates and is important for healthy hair, nails, and skin.

Vitamin B7, or biotin, is an important nutrient, but deficiency is rare with a well-balanced diet. 维生素B7，又称生物素，是一种重要的营养成份，但是如果饮食均衡，很少会出现缺少的情况。