Iron
Written by Fertility Decoded. Reviewed by D R, MS (OBG), FRM. Review date: 31 August 2026.
The verdict
Standard treatment for iron-deficiency anaemia, which itself impairs ovulation; the specific claim that supplementing beyond correcting deficiency boosts fertility rests on one unreplicated observational study.
An essential mineral; iron-deficiency anaemia is common in reproductive-age women, especially in India.
What the evidence shows
One large prospective cohort (Nurses' Health Study II, ~18,500 women) found nonheme iron supplement users had a lower risk of ovulatory infertility (RR 0.60) — but this is observational, not a trial, and later studies (Hahn 2019, Jiménez-Cardozo 2023) did not consistently replicate the association.
Standard-care angle: iron-deficiency anaemia itself is well-established to impair ovulation and overall pregnancy health — this is a "get tested, treat if deficient" item, not a blind supplementation recommendation. Excess iron has its own risks in non-deficient people.
Evidence tier
Standard care🟢 Recommended regardless of any fertility-boosting claim — a baseline, not a supplement bet.
Frequently asked questions
- Iron treats iron-deficiency anaemia, which itself impairs ovulation — so it's a 'test and treat if deficient' item. Evidence for supplementing beyond correcting deficiency rests on one unreplicated observational study.
- Not routinely — excess iron carries its own risks. Test first.
Does iron improve fertility?
Should I take iron if I'm not deficient?
Sources
Take this further
Sources last reviewed .