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|Section2= |Section6= |Section7= }} Menadione is a synthetic chemical compound sometimes used as a nutritional supplement because of its vitamin K activity. It is an analog of 1,4-naphthoquinone with a methyl group in the 2-position. ==Terminology== It is sometimes called vitamin K3, although derivatives of naphthoquinone are not naturally occurring chemicals and therefore do not qualify as vitamins, and without the side chain in the 2-position they cannot exert all the functions of the K vitamins. Menadione is metabolized by the human body into K2 which uses alkylation to yield menaquinones (MK-n, n=1-13; K2 vitamers), hence is better classified as a provitamin. It is also known as "menaphthone".〔(【引用サイトリンク】title=Vitamin K )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Menadione」の詳細全文を読む スポンサード リンク
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