Previous studies on the benefits of antioxidant supplements to fight dementia have been inconclusive.
US researchers studied the effects of beta-carotene on cognitive ability in two groups of men.
In 1982, 4,052 men were randomly assigned to take 50mg beta-carotene or placebo every other day.
After 18 years' follow-up, men who took beta-carotene had higher scores for several cognitive tests compared with men who took the placebo. But this link was not noted in men followed up for two to five years.
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