We know our bodies need vitamin D. And eating vitamin D with certain other foods can help your body absorb and use that ...

A lack of vitamin B12 in the diet Gastrointestinal disorders that interfere with vitamin B12 absorption, like Crohn's or celiac disease. Pernicious anemia, a specific kind of anemia that occurs ...

Having Crohn's or kidney disease and taking certain medications may inhibit vitamin D absorption. If you have trouble absorbing vitamin D, try a supplement with fatty and/or magnesium-rich foods.