Figure 4From: Effect of folate intake on health outcomes in pregnancy: a systematic review and meta-analysis on birth weight, placental weight and length of gestation Response of length of gestation to supplementation with folic acid or 5-methyltetrahydrofolate. Abbreviations: a, 5-methyltetrahydrofolate versus placebo; b, 5-methyltetrahydrofolate and with fish oil versus fish oil.Back to article page