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The Recommended Dietary Allowance (RDA) is the average daily dietary intake level that is sufficient to meet the nutrient requirements of nearly all (97-98%) healthy individuals in each life-stage and gender group. There is insufficient evidence to establish a RDA for vitamin D. Instead, an Adequate Intake (AI), a level of intake sufficient to maintain healthy blood levels of an active form of vitamin D, has been established. The 1998 AIs
for vitamin D for adults, in micrograms (mcg) and International Units
(IUs) are:
| Life-Stage |
Men |
Women |
| Ages 19-50 |
5 mcg* or 200 IU |
5 mcg* or 200 IU |
| Ages 51-69 |
10 mcg* or 400 IU |
10 mcg* or 400 IU |
| Ages 70 + |
15 mcg* or 600 IU |
15 mcg* or 600 IU |
|
*1 mcg vitamin D = 40 International Units
(IU) |
Estimates of vitamin D intake in the United States are not available because dietary surveys do not assess vitamin D intake. Dietary intake of vitamin D is largely determined by the intake of fortified food.
|
