Vitamin E (Natural d-alpha-tocopherol)
Natural RRR-alpha-tocopherol. More bioavailable than synthetic forms.
Data verified against NIHLast verified: 2026-02-01
IU → mgmg → IU
Result
0 mg
Conversion factor: 1 IU = 0.67 mg
Source: NIH Office of Dietary Supplements, WHO 2026
Common Dosages
| IU | mg |
|---|---|
| 100 IU | 67 mg |
| 200 IU | 134 mg |
| 400 IU | 268 mg |
| 800 IU | 536 mg |
| 1,000 IU | 670 mg |
Click any row to use that value in the calculator
Frequently Asked Questions
400 IU of Natural Vitamin E (d-alpha-tocopherol) equals 268 mg. The conversion factor is 1 IU = 0.67 mg for the natural form.
Natural Vitamin E (d-alpha-tocopherol) has a conversion factor of 1 IU = 0.67 mg, while Synthetic Vitamin E (dl-alpha-tocopherol) uses 1 IU = 0.45 mg. Natural Vitamin E is more bioavailable and biologically active than synthetic forms.
The tolerable upper intake level (UL) for Vitamin E is 1000 mg per day for adults, regardless of whether it is natural or synthetic form. Excessive intake may increase bleeding risk.