A letter published this year in The Archives Of Internal Medicine reported the results of a study in which vitamin D reduced menstrual pain.
Scientists gave a group of women with severe painful periods 300,000iu vitamin D five days before the beginning of their next menstrual cycle, while a separate group of women took placebo pills.
Among women in the placebo group, 40% took pain relieving drugs to cope with their periods. Not a single woman in the vitamin D group needed any pain drugs.
300,000iu vitamin D per month is equivalent to 5,000iu per day.
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