Big effect
A meta-analysis found zinc supplementation in pregnancy tied to a 77% lower risk of fetal growth restriction — but the effect comes from pooled studies in higher-risk groups, not the general population.
This is a striking early data point for zinc's potential in high-risk pregnancies, but the lack of blinding in the original trials and the fact it's among the first indexed analyses on this specific pairing means we need replication in well-controlled general-population studies before assuming it applies broadly.
A systematic review of zinc supplementation in pregnancy reported that taking zinc alone (not combined with iron and folate) was linked to a dramatically lower rate of intrauterine growth restriction — a condition where a baby fails to grow properly in the womb. However, the finding comes from a meta-analysis of unblinded studies that largely involved women with anemia, gestational diabetes, or other risk factors, so the 77% risk reduction might not hold for healthy pregnancies; other outcomes like Apgar scores and birth length also improved significantly, but the overall pregnancy outcome measure did not reach statistical significance.
Where this fits in the evidence
This is among the first studies we've indexed on Zinc for Reduced Intrauterine Growth Restriction Rate — treat it as an early signal until more research accumulates.
The study
- Meta-Analysis
- 2025-08-20
- Journal of evidence-based medicine
- PubMed: 40836314
- DOI: 10.1111/jebm.70061
- Full study breakdown →
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