Iron Supplement Effects On Stool Color

Iron deficiency anemia is often treated with iron supplements. These supplements contain ferric or ferrous acid, according to the Office of Dietary Supplements, and are designed to replenish the body's iron stores. Iron supplements carry a few side effects, but are generally quite safe.

Stool Color

Change in stool color is to be expected when taking iron supplements. Anything from dark brown to black is considered healthy. In fact, if your stools do not blacken, this is a sign that your supplement is not working as it should, according to the University of Maryland Medical Center. Your body might not absorb the iron for a number of reasons.

Causes of Malabsorption

If you are taking your supplement with a caffeinated drink or milk, the tablet will not be correctly absorbed. Taking a calcium supplement at the same time or quickly after taking iron will have the same effect as drinking a dairy product with it, as will any antacids. The iron should be taken an hour before meals, although this can increase the associated side effects of iron supplementation.

Problematic Color

If your stools are any other color than black, you may need to consult a doctor. If your stools were tar-like and black before you began supplementation, this may be due to indicate intestinal bleeding, according to the National Heart Lung and Blood Institute. If you see any blood or red coloring in your stools, see a doctor immediately, as this can also be a sign of intestinal bleeding.

Other Side Effects

Iron supplements can upset all aspects of your digestive system. Besides black stools, you may experience constipation. MedlinePlus notes that you may also experience stomach upsets. Building up to the recommended dose over a period of days may help with these side effects. Take a half a tablet in place of one for three days, then take your recommended dose thereafter.

Medical Treatment

There is no need to seek treatment for blackened stools, if the change in color happens after you commence your treatment. When you cease treatment, the change in color will also cease. As the change in color is often coupled with constipation, ask a doctor or pharmacist to recommend an appropriate laxative or stool softener.