فيتامين ب 12
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فيتامين ب 12 او المسمى بالكوبالامين: هو عبارة عن فيتامين معقد التركيب مقارنة بغيره من الفيتامينات قابل للإنحلال بالماء. لا يتم تصنيعه من قبل الحيوانات او النباتات أو الفطريات. فقط البكتيريا وخاصة اللاهوائية منها والعتائق في حالة وجود الكوبلت لها القدرة على تصنيعه. البكتيريا النافعة في أمعاء الإنسان أيضا لها القدرة على صنع فيتامين ب12 ولكن جسم الإنسان لا يستطيع إمتصاصه لإن التصنيع يتم في القولون وليس في اللفائف مكان الإمتصاص. يمكن الحصول عليه من الأغذية الحيوانية كاللحوم الحمراء والبيض والسمك والكيد ومنتجات الألبان. في معدة الحيوانات الإجترارية توجد بكتريا تقوم بتصنيعه ومن ثم يتم تخزينه في العضلات والكبد وإفرازه في الحليب. ينصع بأخذ الأغذية الغنية بفيتامين ب12 وذلك للحصول على كمية كافية منه والتي تقدر 3 ميكروجرام لليوم الواحد.
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