Quick answer
NIH says accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6, and that at least 43 US children died from iron supplements between 1983 and 2000. It sets the upper limit for iron at 40 mg a day from infancy to age 13 and 45 mg for teens.1,2
Key facts
- NIH reports at least 43 US children died from ingesting high-dose iron supplements between 1983 and 2000.1
- FDA requires solid iron supplements to carry a warning that accidental overdose is a leading cause of fatal poisoning in children under 6, and to be kept out of reach.1
- The upper limit is 40 mg a day for infants and children up to 13 and 45 mg for teens 14 to 18, from food and supplements.1,2
- Products with 250 mg or more of elemental iron per container must be in child-resistant packaging, a rule in place since 1978.1
- NIH lists teenage girls among the groups at risk of getting too little iron.1
How dangerous is iron for young children?
The first documented risk is poisoning. Between 1983 and 2000, at least 43 children in the US died after swallowing iron supplements with high doses, 36 to 443 mg of iron per kg of body weight, and accidental ingestion of iron supplements caused about a third of poisoning deaths among children reported in the US between 1983 and 1991.1
Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Iron tablets and capsules must carry a warning to keep them out of children's reach and to call a doctor or poison control center after an accidental overdose.1,2
MedlinePlus says children can sometimes develop iron poisoning by swallowing too many iron pills or liquid, and lists fatigue, loss of appetite, dizziness, nausea, vomiting, headache, shortness of breath and a grayish skin color among the symptoms. A parent whose child has swallowed iron should call a doctor or poison control immediately.3
What rules cover iron supplement labels and packaging?
In 1997, FDA began requiring oral supplements with more than 30 mg of elemental iron per dose to be sold in single-dose packaging with strong warning labels, and many makers replaced the sugar coating on tablets with film. Between 1998 and 2002, only one child death from an iron-containing tablet was reported. FDA dropped the single-dose rule in 2003 after a court decision, and now requires solid iron supplements to carry the warning quoted above.1
Since 1978 the Consumer Product Safety Commission has required child-resistant packaging for supplements with 250 mg or more of elemental iron per container.1
What are the iron upper limits and amounts for kids and teens?
| Age | Amount NIH gives a day | Upper limit a day |
|---|---|---|
| 7 to 12 months | 11 mg | 40 mg |
| 1 to 3 years | 7 mg | 40 mg |
| 4 to 8 years | 10 mg | 40 mg |
| 9 to 13 years | 8 mg | 40 mg |
| 14 to 18 years | 11 mg for boys, 15 mg for girls | 45 mg |
The upper limits were set from stomach and bowel effects after iron salts, and doctors sometimes prescribe more for a while to rebuild low stores. NIH lists infants, young children, teenage girls, pregnant women and premenopausal women as at risk of getting too little, so a doctor may check iron stores before any supplement.1
Serum ferritin, a measure of the body's iron stores, is the most efficient and least costly test for low iron. A level below 30 mcg/L suggests low iron, though other factors can push ferritin up.1
Who should ask a doctor about iron for a child or teen
- Parents of any child under 14 who might take iron, who should ask the pediatrician first, since the label warning says to keep iron out of reach.1
- Parents of teen girls with heavy periods or tiredness, who should ask a doctor about a blood test.1
- Parents of any child who swallowed iron tablets or liquid, who should call a doctor or poison control center immediately.1,3
- Parents asking about an iron infusion for a teen, which the sources checked do not address.
Questions people ask
Is iron safe for kids?
NIH says accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6, and iron products must carry a warning to keep them out of reach. Ask your pediatrician about any iron product.1,2
Are iron supplements safe for teens?
NIH gives 11 mg a day for teen boys and 15 mg for teen girls, and an upper limit of 45 mg. Ask your doctor for a blood test before a teen starts iron.1,2
Is iron good for teens?
NIH lists teenage girls among the groups at risk of getting too little iron, so a doctor may check stores. It does not suggest iron for every teen. Ask your doctor.1
Is iron infusion safe for teens?
The sources checked cover iron taken by mouth, not infusions, which is not a finding either way. Ask your doctor.1
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Sources
- Office of Dietary Supplements, National Institutes of Health. Iron: Fact Sheet for Health Professionals. Updated September 4, 2025. Opened 2026-10-07.
- Office of Dietary Supplements, National Institutes of Health. Iron: Fact Sheet for Consumers. Updated August 17, 2023. Opened 2026-10-07.
- MedlinePlus Medical Encyclopedia. Iron in diet. U.S. National Library of Medicine. Review date 1/21/2025. Opened 2026-10-11.
This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.