Ana buƙatar vitamin B12 (cobalamin) don samar da lafiyayyun jajayen ƙwayoyin jini, da kuma don jijiyoyi, ƙwaƙwalwa da laka su ci gaba da aiki yadda ya kamata. Jiki ba zai iya samar da shi ba: yana fitowa ne daga abincin dabbobi kamar madara, yogot, cuku, ƙwai, nama da kifi, da kuma abincin da aka ƙara wa B12 (fortified).
Don jiki ya sha B12, ciki yana samar da wani sinadarin furotin mai suna intrinsic factor, sannan ana shan B12 ɗin a ƙarshen ƙaramin hanji. Matsala a ko'ina a wannan hanya, ko ƙarancin B12 a abinci, na iya kawo ƙaranci.
Jiki yana ajiye B12 na shekaru da dama a cikin hanta, don haka alamomi sukan shigo a hankali cikin watanni ko shekaru. Shi ya sa ƙarancin B12 yana da sauƙin ɗora wa tsufa, damuwa ko yawan hidima.



