vitamins

abstract acid ascorbic atom atomic b12 background biology calciferol calcium calories chemical chemics chemistry cobalamine college colors colours complex concept daily diet dietary diets difficult disease drug drugs education elements energy essential folic food formula formulas health healthcare healthiness healthy hydrogen illustration individual isolated knowledge lesson medical medicine molecular molecule molecules niacin nuclear nutrition optimal organic pantothenic pharmaceutical pharmacy phylloquinone pyridoxine reaction research retinol riboflavin science scientific substance supplement symbol symbols therapy thiamine tocopherol trans university vector vitamin vitamins white