Women at risk of carrying babies with spina bifida and other neural tube defects may benefit from taking inositol, also called vitamin B8, alongside folic acid during pregnancy, suggests research from a team at the UCL Institute of Child Health.
The finding, published in the British Journal of Nutrition, comes from the PONTI study (Prevention of Neural Tube defects by Inositol), a four year study of around 100 women with a history of pregnancies affected by neural tube defects (NTDs).
The trial was made possible thanks to funding from Sparks and the Medical Research Council, with additional support from the NIHR Biomedical Research Centre, Newlife Foundation for Disabled Children, and Great Ormond Street Hospital Children’s Charity.
Folic acid is routinely recommended to women during early pregnancy to prevent NTDs, such as spina bifida and anencephaly, which affect around 1 in every 1000 pregnancies, or 700 a year in the UK. Despite being effective in many cases, some women who take folic acid still go on to carry babies with NTDs.
Researchers at the UCL Institute of Child Health, led by Professor Andrew Copp, have now shown that, in a group of ‘high risk’ women, inositol taken alongside folic acid before and during pregnancy could be more effective at preventing NTDs than folic acid alone.
The team studied 99 women aged between 22 and 40 who had a previous pregnancy affected by a NTD and were planning to get pregnant again in the next year. Half of the women agreed to be randomly assigned to groups who were directed to take either 5 mg of folic acid daily or 5 mg of folic acid plus 1 g of inositol daily. The other women chose not to be randomised but many decided to take 5 mg of folic acid plus 1g of inositol in their next pregnancy. Woman took their supplements in tablet form up to a year prior to conception and for the first three months of pregnancy.
The team found that of the women who took just folic acid, three carried babies with a NTD. In the group who took folic acid and inositol, including both those who were randomised and those who were not, there were no babies affected by a NTD. No adverse effects were reported in any of the women or their babies who took inositol.
The researchers now recommend a study of a larger group of women planning pregnancies, in order to confirm the beneficial effects of inositol.
Andrew Copp, Professor of Developmental Neurobiology and the lead researcher, says: “Folic acid is vital for women to take when planning a pregnancy, in order to avoid neural tube defects. However, we know that folic acid is not effective in all cases, and some women have pregnancies affected by NTDs despite taking the supplement. Our results suggest that taking folic acid and inositol together may provide greater protection for this group of women, giving them a better chance of having a baby without the disorder.”
He cautions, however: “Our findings certainly do not mean that pregnant women should stop taking folic acid and start taking inositol instead. Rather, our research suggests that women who have had one pregnancy affected by an NTD may be best advised to take both folic acid and inositol when planning their next pregnancy. This should be done under supervision of their GP or obstetrician.”
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- UCL Institute of Child Health London
- Neural tube defects