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.

Though this vitamin is often called Vitamin H, it is actually part of the B complex groups of vitamins. 这种维生素虽然叫维生素H，但实际上是一种B族维生素。