Yes, evidence supports that iron supplementation during pregnancy helps reduce the risk of anemia at delivery.

Here's what the research shows:

Key Findings from Pillser's Research Database

Reduced Iron Deficiency
Pillser's database includes 4 studies on iron supplementation and iron deficiency, all of which reported beneficial effects. Notably, the strongest evidence comes from meta-analyses in pregnant women, showing large reductions in maternal iron deficiency risk at term (e.g., RR 0.24)¹. This is rated as moderate evidence with effect sizes ranging from small to large.

Increased Hemoglobin Levels
Across 5 studies, 4 reported beneficial effects of iron on hemoglobin levels, with 4 reaching statistical significance². The evidence level is moderate, with consistently small but positive effects. Doses studied ranged from 7–105 mg/day of elemental iron.

Increased Ferritin Levels
Iron supplementation also improved ferritin (iron storage) levels — 3 out of 4 studies showed beneficial effects, with a moderate effect size³. This is important because low ferritin reflects depleted iron stores, which precedes anemia.

Reduced Anemia Directly
Of the 2 studies examining anemia as an outcome, 1 reported beneficial effects and 1 was neutral (none showed harm)⁴.

Bottom Line

The evidence suggests that iron supplementation during pregnancy is effective in reducing the risk of iron deficiency and anemia at delivery, particularly in women who are iron-deficient or at risk of deficiency. The strongest evidence points to large reductions in iron deficiency at term, and moderate improvements in hemoglobin and ferritin levels.

⚠️ Note: Always consult your healthcare provider before starting any supplement during pregnancy, as they can determine the appropriate dosage based on your individual iron status and needs.

Footnotes

1. Pillser research database, Reduced Iron Deficiency ↩

2. Pillser research database, Increased Hemoglobin Levels ↩

3. Pillser research database, Increased Ferritin Level ↩

4. Pillser research database, Reduced Anemia ↩