Vitamin A (Retinol)
Preformed Vitamin A from animal sources. Essential for vision, immune function, and reproduction.
Data verified against NIHLast verified: 2026-02-01
IU → mcg RAEmcg RAE → IU
Result
0 mcg RAE
Conversion factor: 1 IU = 0.3 mcg RAE
Source: NIH Office of Dietary Supplements, WHO 2026
Common Dosages
| IU | mcg RAE |
|---|---|
| 2,500 IU | 750 mcg RAE |
| 5,000 IU | 1,500 mcg RAE |
| 10,000 IU | 3,000 mcg RAE |
| 25,000 IU | 7,500 mcg RAE |
Click any row to use that value in the calculator
Frequently Asked Questions
Multiply the IU value by 0.3 to get mcg RAE. For example, 5000 IU of Retinol = 1500 mcg RAE. This conversion applies specifically to preformed Vitamin A (retinol) from animal sources.
Retinol (preformed Vitamin A) uses a conversion factor of 1 IU = 0.3 mcg RAE, while Beta-Carotene (provitamin A) uses 1 IU = 0.05 mcg RAE. Retinol is 6 times more potent per IU because it is already in the active form.
The tolerable upper intake level (UL) for preformed Vitamin A (retinol) is 3000 mcg RAE (10,000 IU) per day for adults. Excessive retinol intake can cause liver toxicity and other adverse effects.