名詞 provitamin:

1. vitamin precursor; a substance that is converted into a vitamin in animal tissues

pro.vi.ta.min

n.（名詞）
A vitamin precursor that the body converts to its active form through normal metabolic processes. Carotene, for example, is a provitamin of vitamin A.
維生素原：一種由身體通過正常新陳代謝過程，將其轉(zhuǎn)化成活躍形式的維生素的前體，比如，胡蘿卜素是維生素A的維生素原