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“The authors of this study claim that vitamin and mineral supplements must produce clinical effects before pregnant women are encouraged to take them. However, much of the evidence for vitamin supplementation in pregnancy comes from studies carried out in low-income countries, where women are more likely to be undernourished or malnourished than within the UK population.”īut Dr Carrie Ruxton, a dietitian and spokeswoman for trade body the Health Supplements Information Service, rejected the findings. In a direct challenge to the evidence behind the supplement industry’s claims, the report says: “Many nutritional supplements containing vitamins, minerals and other micronutrients are heavily marketed to women for all stages of pregnancy. But it advised expectant mothers to keep taking it daily throughout pregnancy and breastfeeding anyway.
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The new review of the evidence found little data from clinical trials that taking vitamin D can lower the risk of a woman experiencing complications during either her pregnancy or birth. The review confirms the existing official advice that all mothers to be should have enough folic acid and vitamin D but cautions against the others.Įxpectant mothers are encouraged to take 400 micrograms of folic acid daily until they are 12 weeks into their pregnancy in order to lower the risk of their baby suffering from any neural tube defects, which can affect the brain and spine. The study led to a row with the supplements industry, which condemned its findings as “confusing” and “unhelpful” for pregnant women.
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However, it adds: “We found no evidence to recommend that all pregnant women should take prenatal multi-nutrient supplements beyond the nationally advised folic acid and vitamin D supplements, generic versions of which can be purchased relatively inexpensively.” They are popular because, as the study says: “Maternal deficiency in key nutrients has been linked to pre-eclampsia, restricted foetal growth, neural tube defects, skeletal deformity and low birth weight.” An unknown number of women take supplements during their pregnancy that typically contain more than 20 vitamins and minerals, including vitamins B1, B2, B3, B6, B12, C, D, E, K, folic acid, iodine, magnesium, iron, copper, zinc and selenium.