Half the group was randomly assigned to receive the recommended daily dose of vitamin D (400 international units) plus a 50,000-unit vitamin D capsule once a week.
Right now, the recommended daily allowance of vitamin D is 400 international units, but the Institute of Medicine is currently revisiting those numbers.
目前，维生素D的日推荐剂量为400IU，但是医学研究会正重新调整这一剂量。
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Pregnant women or women who may become pregnant should be certain to get enough folate, or folic acid, a B-complex vitamin — 600 units a day, rather than 400.