Dietary Iron and Iron Supplements

Iron is a mineral that's necessary for life. Iron plays a key role in the making of red blood cells, which carry oxygen. You can get iron from food and from supplements. If you don't have enough iron, you may develop anemia, a low level of red blood cells. However, most people in the U.S. get their iron from food.

Why do people take iron?

Iron supplements are most often used for certain types of anemia. Anemia can cause fatigue and other symptoms. If you have symptoms of anemia, seek care from your health care provider. Don't try to treat it on your own.

Iron supplements are often prescribed to treat anemia caused by:

Those who may be at risk for iron deficiency include preterm infants, young children, teenage girls, and pregnant women, as well as people with certain health conditions including, chronic heart failure, Crohn's disease, celiac disease and ulcerative colitis. Iron supplements are commonly recommended for women who are pregnant or of childbearing age to help prevent anemia. Before taking an iron supplement, ask your health care provider if it is right for you.

How much iron should you take?

The recommended dietary allowance (RDA) includes the iron you get from both the food you eat and any supplements you take.

Category

Recommended Dietary Allowance (RDA)

CHILDREN

7-12 months

11 mg/day

1-3 years

7 mg/day

4-8 years

10 mg/day

9-13 years

8 mg/day

FEMALES

14-18 years

15 mg/day

19-50 years

18 mg/day

51 years and over

8 mg/day

Pregnant

27 mg/day

Breastfeeding 

Under 19 years: 10 mg/day

 

19 years and over: 9 mg/day

MALES

14-18 years

11 mg/day

19 years and up

8 mg/day

Strict vegetarians may need to take in higher levels of iron.

At high doses, iron is toxic. For adults and children ages 14 and up, the upper limit -- the highest dose that can be taken safely -- is 45 mg a day. Children under age 14 should not take more than 40 mg a day.

Continued

The American Academy of Pediatrics suggests that -- starting at 4 months of age -- full-term, breastfed infants should be supplemented with 1 mg/kg per day of oral iron. This should continue until iron-containing complementary foods, such as iron-fortified cereals, are introduced in the diet. Standard infant formula that contains 12 mg/L iron can fulfill the iron needs of an infant until age 1.

Ask your health care provider how much iron supplement you or your child should take, if any.

Can you get iron naturally from foods?

For most people, a good diet provides enough iron. Natural food sources of iron include:

  • Meat, fish, and poultry
  • Vegetables, like spinach, kale, and broccoli
  • Dried fruits and nuts
  • Beans, lentils, and peas

Iron is also added to many fortified foods, such as cereals and enriched breads.

Iron from animal sources is absorbed better by the body. However, you can help your body absorb plant-based iron by eating a fruit or vegetable that is high in vitamin C (for example, red bell peppers, kiwis, oranges).

 

What are the risks of taking iron?

  • Side effects. Taken at normal doses, iron supplements may cause upset stomach, stool changes, and constipation.
  • Risks. Don't start taking iron supplements unless your health care provider tells you that you need them. That's especially true if you have a chronic health condition. Women who plan to become pregnant should also check with a health care provider before they start daily iron supplements.
  • Interactions. Iron can interact with many different drugs and supplements. They include antacids and proton pump inhibitors, some antibiotics, calcium, and others. Be sure your doctor is aware of all of the prescription and over the counter medicines that you are taking if she suggests you take an iron supplement.
  • Overdose. Iron overdose is a common cause of poisoning in children. It can be fatal. Signs of an iron overdose include severe vomiting and diarrhea, stomach cramps, pale or bluish skin and fingernails, and weakness. Treat these signs as a medical emergency. Call poison control and get medical help immediately.

 

WebMD Medical Reference Reviewed by Melinda Ratini, DO, MS on October 23, 2017

Sources

SOURCES:
Armstrong, C. American Family Physician. "AAP Reports on Diagnosis and Prevention of Iron Deficiency Anemia," Mar 1, 2011
Baker, R. Pediatrics, November 2010.
Longe, J., ed. The Gale Encyclopedia of Alternative Medicine, second edition, 2004.
Natural Standard Patient Monograph: "Iron."
Office of Dietary Supplements: "Iron."
UpToDate: "Approach to the Adult Patient With Anemia."
Centers for Disease Control: "Iron and Iron Deficiency."
National Institutes of Health: "Iron."
U.S. Preventative Services Task Force: "Iron Deficiency Anemia in Young Children: Screening."

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