biotin

例句：

1. 1. Biotin is an essential nutrient for hair and nails.
   生物素是头发和指甲所必需的营养。
2. 2.The supplement contains biotin to help with digestion.
   这种补充剂含有生物素，有助于消化。
3. 3. She took a daily dose of biotin supplements to improve her skin health.
   她每天服用生物素补充剂来改善皮肤健康。