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Background: Oxidative stress could play a part in pre-eclampsia, and there is some evidence to suggest that vitamin C and vitamin E supplements could reduce the risk of the disorder. Our aim was to investigate the potential benefit of these antioxidants in a cohort of women with a range of clinical risk factors. Methods: We did a randomised, placebo-controlled trial to which we enrolled 2410 women identified as at increased risk of pre-eclampsia from 25 hospitals. We assigned the women 1000 mg vitamin C and 400 IU vitamin E (RRR α tocopherol;n = 1199) or matched placebo (n = 1205) daily from the second trimester of pregnancy until delivery. Our primary endpoint was pre-eclampsia, and our main secondary endpoints were low birthweight ( < 2.5 kg) and small size for gestational age ( < 5th customised birthweight centile). Analyses were by intention to treat. This studyis registered as an International Standard Randomised Controlled Trial, number ISRCTN 62368611. Findings:Of 2404 patients treated, we analysed 2395 (99.6% ). The incidence of pre-eclampsia was similar in treatment and placebo groups (15% [n = 181]vs 16% [n = 187], RR 0.97[95% CI 0.80- 1.17]). More low birthweight babies were born to women who took antioxidants than to controls(28% [n = 387]vs 24% [n = 335], 1.15 [1.02- 1.30]), but small size for gestational age did not differ between groups(21% [n = 294]vs 19% [n = 259], 1.12 [0.96- 1.31]). Interpretation:Concomitant supplementation with vitamin C and vitamin E does not prevent pre-eclampsia in women at risk, but does increase the rate of babies born with a low birthweight. As such, use of these high-dose antioxidantsis not justified in pregnancy.
Background: Oxidative stress could play a part in pre-eclampsia, and there is some evidence to suggest that vitamin C and vitamin E supplements could reduce the risk of the disorder. Our aim was to investigate the potential benefit of these antioxidants in a cohort of women with a range of clinical risk factors. Methods: We did a randomized, placebo-controlled trial to which we were enrolled 2410 women identified as at increased risk of pre-eclampsia from 25 hospitals. We assigned the women 1000 mg vitamin C and 400 IU Our primary endpoint was pre-eclampsia, and our main secondary endpoints were low birthweight (<2.5 kg) vitamin E (RRR α tocopherol; n = 1199) or matched placebo (n = 1205) daily from the second trimester of pregnancy until delivery. and small size for gestational age (<5th customised birthweight centile). Analyses were by intention to treat. This study was registered as an International Standard Randomized Controlled Trial, number ISRCTN 62368611. Findings: Of 2404 patients The incidence of pre-eclampsia was similar in treatment and placebo groups (15% [n = 181] vs 16% [n = 187], RR 0.97 [95% CI 0.80-1.17] More low birthweight babies were born to women who took antiperspective than to controls (28% [n = 387] vs 24% [n = 335], 1.15 [1.02- 1.30]), but small size for gestational age did not differ between groups (21% [n = 294] vs 19% [n = 259], 1.12 [0.96- 1.31]). Interpretation: Concomitant supplementation with vitamin C and vitamin E does not prevent pre-eclampsia in women at risk, but does increase the rate of babies born with a low birthweight. As such, use of these high-dose antioxidantsis not justified in pregnancy.