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Recommended Daily Allowances. Adult men and women, including pregnant or nursing women, should consume 15 micrograms of vitamin D daily, according to the Institute of Medicine's Food and Nutrition Board. Vitamin D intake can also be measured in International Units; by this measure, adults require 600 International Units daily. Seniors over 70 years of age have a higher RDA -- 800 International Units, or 20 micrograms, of vitamin D each day.
Why does the Vitamin D Council recommend 5,000 IU/day? Where did the Vitamin D Council get its recommendation that adults take 5,000 IU/day of vitamin D3 for the rest of their life? The Institute of Medicineâs Food and Nutrition Board say 600 IU/day is enough for adults and the Endocrine Society says 2,000 IU/day is enough for most adults.