Taking vitamin E could slightly increase the risk of a particular type of stroke, a study says.
The British Medical Journal study found that for every 1,250 people there is the chance of one extra haemorrhagic stroke - bleeding in the brain. Researchers from France, Germany and the US studied nine previous trials and nearly 119,000 people. But the level at which vitamin E becomes harmful is still unknown, experts say.
The study was carried out at Harvard Medical School, Boston, and INSERM in Paris. Haemorrhagic strokes are the least common type and occur when a weakened blood vessel supplying the brain ruptures and causes brain damage.
Researchers found that vitamin E increased the risk of this kind of stroke by 22%. The study also found that vitamin E could actually cut the risk of ischaemic strokes - the most common type of stroke - by 10%.
Ischaemic strokes account for 70% of all cases and happen when a blood clot prevents blood reaching the brain. Experts found vitamin E could cut the risk, equivalent to one ischaemic stroke prevented per 476 people taking the vitamin.