vitamin       
noun [ C ]  chemistry, biology uk/ˈvɪt.ə.mɪn/ us/ˈvaɪ.t̬ə-/
B2 维生素;维他命
any of a group of natural substances that are necessary in small amounts for the growth and good health of the body
  a vitamin pill 维生素片 
 Oranges are full of vitamin C. 橙子富含维生素C。 
 - More examples
 - A diet deficient in vitamin D may cause the disease rickets.
 - Studies suggest that regular intake of the vitamin significantly improves brain function.
 - Oranges are a good source of vitamin C.
 - The illness depletes the body of important vitamins.
 - Which vitamins should you take for skin problems?