Getting vitamin E from food during pregnancy is safe and important for both you and your baby. Taking high-dose vitamin E supplements, however, is a different story. The World Health Organization does not support routine vitamin E supplementation during pregnancy, and several large trials have linked supplement-level doses to increased risks of complications like premature rupture of membranes.
The recommended daily amount of vitamin E during pregnancy is 15 mg, the same as for non-pregnant women. Most people get enough from a normal diet without needing an extra pill. Here’s what the research says about the risks, the benefits that didn’t pan out, and how to get what you need safely.
How Much Vitamin E You Actually Need
Pregnant women of all ages need 15 mg of vitamin E per day. That number doesn’t increase during pregnancy, unlike nutrients such as folate and iron that jump significantly. If you’re breastfeeding, the recommendation rises slightly to 19 mg per day.
The tolerable upper intake level, meaning the maximum amount unlikely to cause harm, is 1,000 mg per day for adults 19 and older and 800 mg for those 14 to 18. Those numbers sound high, but many supplement capsules contain 400 IU (about 268 mg of the natural form), which is already many times above the daily requirement. The gap between what you need (15 mg) and what a typical supplement provides is enormous, and that’s where problems begin.
Why High-Dose Supplements Raise Concerns
Several well-designed trials have tested vitamin E supplements during pregnancy, primarily in combination with vitamin C, to see if they could prevent preeclampsia or protect the baby. The results were consistently disappointing and sometimes harmful.
A large trial published in the New England Journal of Medicine gave nearly 1,900 women either 400 IU of vitamin E plus 1,000 mg of vitamin C daily or a placebo. Preeclampsia rates were essentially the same in both groups (6.0% with vitamins vs. 5.0% with placebo). The supplements did not reduce the risk of low birth weight or serious outcomes for the infant.
More troubling, a separate trial of women with chronic hypertension or prior preeclampsia found that the same vitamin C and E combination nearly doubled the rate of premature rupture of membranes. In the supplement group, 10.6% of women experienced their water breaking early compared to 5.5% in the placebo group. The rate of preterm premature rupture of membranes (before 37 weeks) was also significantly higher: 4.6% versus 1.7%. The researchers concluded that this supplement combination should be abandoned for women at risk of preeclampsia.
A Cochrane review pooling data from multiple trials confirmed the pattern. Women taking vitamin E supplements had a 77% higher risk of term premature rupture of membranes compared to those on placebo. The review did find one potential benefit: a reduced risk of placental abruption. But weighing all outcomes together, the evidence does not favor routine supplementation.
Possible Links to Heart Defects
A large study using data from the National Birth Defects Prevention Study (1997 to 2005) examined whether maternal vitamin E intake was associated with congenital heart defects. Women in the third quartile of vitamin E intake had a 17% higher odds of having a baby with a heart defect compared to women with the lowest intake. For specific defects involving the left side of the heart, the association was stronger: a 46% increase in odds for left ventricular outflow tract obstruction defects and a 75% increase for coarctation of the aorta.
These are observational findings, not proof of cause and effect, and the absolute risk of any individual heart defect remains low. Still, they add to the broader picture suggesting that more vitamin E is not better during pregnancy.
Interactions With Other Nutrients
High-dose vitamin E can interfere with blood clotting, particularly in people who are already low in vitamin K. This matters during pregnancy because newborns naturally have low vitamin K levels at birth. Supplementing with vitamin E during pregnancy could, in theory, worsen this deficit and raise the risk of bleeding problems in the newborn if vitamin K is not given at birth.
Vitamin E also interacts with iron in complex ways. Vitamin E deficiency worsens in the presence of iron overload, while high doses of vitamin E can affect how well your body uses iron. Since most prenatal vitamins already contain iron, adding a separate high-dose vitamin E supplement introduces an unnecessary variable.
What the WHO Recommends
The World Health Organization reviewed the full body of evidence and concluded that vitamin E supplementation during pregnancy does not prevent fetal or neonatal death, preterm birth, preeclampsia, or poor fetal growth. This applies to women with both normal and high-risk pregnancies. The WHO does not recommend routine vitamin E supplements for pregnant women.
Getting Enough From Food
The good news is that 15 mg per day is easy to reach through food. Vitamin E is found in many common, pregnancy-friendly foods:
- Sunflower seeds: about 7 mg per ounce
- Almonds: about 7 mg per ounce
- Peanut butter: about 3 mg per two tablespoons
- Spinach (cooked): about 4 mg per half cup
- Avocado: about 3 mg per fruit
- Olive oil and sunflower oil: about 2 mg per tablespoon
A handful of almonds with some spinach at lunch gets you most of the way there. Many prenatal vitamins also include a modest amount of vitamin E, typically in the range of 10 to 30 mg, which is within a safe range and far below the doses used in the clinical trials that showed harm.
Natural vs. Synthetic Forms
If your prenatal vitamin lists vitamin E on the label, you may see either “d-alpha-tocopherol” (natural) or “dl-alpha-tocopherol” (synthetic). The natural form is more bioavailable. In a study measuring vitamin E levels in breast milk, women supplemented with the natural form had 57% higher colostrum concentrations compared to a control group, while those given the synthetic form saw a 39% increase. For practical purposes, this distinction matters most at supplement-level doses. At the small amounts found in prenatal vitamins and food, either form is fine.
The bottom line: vitamin E from your diet and the modest amounts in a standard prenatal vitamin are safe during pregnancy. High-dose standalone supplements, particularly at 400 IU or above, carry real risks with no proven benefit.