The DRIs for vitamin D are based on maintaining skeletal health and have been set using the assumption that sun exposure is minimal.
The DRIs for vitamin D, which can also be found in the DRI tables, are as follows:
 Adequate Intake rather than Recommended Dietary Allowance. |
||
| Age group | Recommended Dietary Allowance (RDA) per day | Tolerable Upper Intake Level (UL) per day |
|---|---|---|
| Infants 0-6 months | 400 IU (10 mcg) |
1000 IU (25 mcg) |
| Infants 7-12 months | 400 IU (10 mcg) |
1500 IU (38 mcg) |
| Children 1-3 years | 600 IU (15 mcg) | 2500 IU (63 mcg) |
| Children 4-8 years | 600 IU (15 mcg) | 3000 IU (75 mcg) |
| Children and Adults 9-70 years |
600 IU (15 mcg) | 4000 IU (100 mcg) |
| Adults > 70 years | 800 IU (20 mcg) | 4000 IU (100 mcg) |
| Pregnancy & Lactation | 600 IU (15 mcg) | 4000 IU (100 mcg) |
The IOM report states that there are no additional health benefits associated with vitamin D intakes above the level of the new RDA.
Total vitamin D intake should remain below the level of the new UL to avoid possible adverse effects. Long-term intakes above the UL increase the risk of adverse health effects.
(Source: canada.ca)