Preterm labor
Supplements studied for preterm labor.
Overview
Algal Oil (3 studies) is the most promising supplement for preterm labor prevention, with trials suggesting that about 1000 mg daily of DHA from algae—especially in women with low pre-pregnancy DHA—may lower early preterm birth risk. A meta-analysis of myo-Inositol with folic acid (1 study source) reported roughly two-thirds lower preterm delivery risk in gestational-diabetes–prone women, though generalizability is uncertain.
Iron (3 studies) does not generally prolong pregnancy, and Vitamin C (3 studies) and Vitamin B6 (2 studies) show no meaningful benefit for preventing preterm labor. See the heatmap and evidence reviews below for full evidence.
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