How to Determine the Amount of Iron in an Iron Supplement

How to Determine the Amount of Iron in an Iron Supplement
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Eating iron-rich foods or taking a multivitamin with iron helps your body maintain adequate iron stores. But when your body's stores are low, it can lead to unusual tiredness, weakness, an inability to concentrate or chronic infections. To alleviate symptoms and rebuild your body's stores of iron, physicians will recommend taking iron supplements. The amount of "elemental iron," the form of iron the body uses, varies in each supplement. Knowing how to determine the exact amount is important.

Step 1

Locate the size of the iron tablet on the front of the label. The standard size is 325 milligrams (mg).

Step 2

Locate the ingredients list on the back or side of the supplement label.

Step 3

Read the form of iron contained in the product. Most preparations contain either the ferrous or ferric form of iron. The National Institutes of Health (NIH) reports that ferrous iron forms are better absorbed than ferric forms.

Step 4

Multiply the size of the iron tablet by the percentage of elemental iron contained in the iron form. Ferrous fumarate contains 33 percent elemental iron, ferrous sulfate contains 20 percent elemental iron and ferrous gluconate contains 12 percent elemental iron, according to the NIH. A standard 325mg tablet would contain 108mg elemental iron in the ferrous fumarate form, 65mg elemental iron in the ferrous sulfate form and 35mg elemental iron in the ferrous gluconate form..

Tips and Warnings

  • The amount of iron absorbed decreases as the dose increases. The Centers for Disease Control and Prevention recommends spacing daily iron supplement doses throughout the day to enhance overall absorption rates. Iron supplements should be taken with either 8 oz. of water or orange juice, according to both the National Anemia Action Council and the NIH. The NIH states that iron absorption is increased by the vitamin C in orange juice.
  • Consult a physician before taking an iron supplement to determine if it is necessary. Iron overload is a serious condition in which excess iron is found in the blood and tissues.

Things You'll Need

  • Iron supplement bottle
  • Conversion chart

References

Article reviewed by Helen Covington Last updated on: Jun 6, 2010

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