Iron Supplementation Guidelines for Teenagers

Recommended Dosage

The Centers for Disease Control and Prevention recommends prescribing 60-120 mg of elemental iron once daily for adolescents with iron deficiency or iron deficiency anemia, taken in the morning on an empty stomach 1, 2
For adolescent girls with confirmed iron deficiency anemia, a treatment dose of 60-120 mg elemental iron daily is recommended 1
For severe or symptomatic anemia in adolescent girls, the higher end of the dosing range (100-120 mg daily) should be used 2
Adolescent boys require a higher dose of 120 mg total elemental iron daily, reflecting increased iron needs during rapid growth 1

Female athletes should consume at least 22 mg/day of dietary iron, and if supplementation is needed, use the standard treatment doses of 60-120 mg elemental iron 3

The American Academy of Pediatrics recommends giving iron as a single morning dose on an empty stomach to maximize absorption 2, 4
If daily dosing causes intolerable gastrointestinal side effects, switching to alternate-day dosing with 100-200 mg elemental iron can increase fractional absorption 4
Taking iron with 250-500 mg vitamin C can enhance absorption, while avoiding food, tea, coffee, or calcium-containing products is recommended 4

The Centers for Disease Control and Prevention recommends continuing treatment for 2-3 months after hemoglobin normalizes to adequately replenish iron stores 1, 2
Hemoglobin should be monitored at 4 weeks, with an expected increase of ≥1 g/dL if treatment is effective 1, 2

Ferrous sulfate is the most cost-effective first-line option, with 200 mg tablets containing 65 mg elemental iron 2, 4
All ferrous salts have similar efficacy and tolerability, with no single formulation having proven advantages 4

Intravenous iron should be considered if oral iron fails after 4 weeks, or in cases of severe symptomatic anemia, chronic inflammatory conditions, or intolerable gastrointestinal side effects 1, 2, 4

Prescribe 60–120 mg elemental iron once daily for adolescent females with confirmed iron‑deficiency anemia. The dose provides adequate iron repletion while minimizing gastrointestinal side effects. 5

Hemoglobin should increase by ≥1 g/dL (≥10 g/L) after 4 weeks of oral therapy if the regimen is effective. Lack of this rise warrants reassessment. 5
Continue oral iron for an additional 2–3 months after hemoglobin normalizes, resulting in a total treatment course of roughly 6–7 months to fully restore iron stores. 5

If hemoglobin fails to rise by ≥1 g/dL after 4 weeks despite confirmed adherence, transition to intravenous iron formulation. 5

Evaluate menstrual blood loss; menorrhagia is responsible for iron deficiency in 5–10 % of menstruating adolescents and should be addressed as a potential primary cause. 6
Assess dietary iron intake and provide education on iron‑rich foods (e.g., red meat, legumes) and absorption enhancers (vitamin C‑containing foods), while advising avoidance of inhibitors (tea, coffee, calcium) around iron dosing. 5