生物素

例句：

1. 1. Biotin is an essential nutrient for hair and skin health.
   生物素是头发和皮肤健康所必需的营养素。
2. 2.The supplement contains biotin to help improve brain function.
   这种补充剂含有生物素，有助于改善大脑功能。
3. 3. Many people take biotin supplements to prevent hair loss due to aging.
   许多人服用生物素补充剂来预防因老化导致的脱发。