Vitamin E (Synthetic dl-alpha-tocopherol)
Synthetic all-rac-alpha-tocopherol. Less bioavailable than natural form.
Data verified against NIHLast verified: 2026-02-01
IU → mgmg → IU
Result
0 mg
Conversion factor: 1 IU = 0.45 mg
Source: NIH Office of Dietary Supplements, WHO 2026
Common Dosages
| IU | mg |
|---|---|
| 100 IU | 45 mg |
| 200 IU | 90 mg |
| 400 IU | 180 mg |
| 800 IU | 360 mg |
| 1,000 IU | 450 mg |
Click any row to use that value in the calculator
Frequently Asked Questions
400 IU of Synthetic Vitamin E (dl-alpha-tocopherol) equals 180 mg. The conversion factor is 1 IU = 0.45 mg for the synthetic form.
Synthetic Vitamin E (dl-alpha-tocopherol) contains a mixture of stereoisomers, only one of which is biologically identical to natural Vitamin E. This results in lower bioavailability (1 IU = 0.45 mg vs. 0.67 mg for natural).
Natural Vitamin E (d-alpha-tocopherol) is generally preferred because it is more bioavailable. However, synthetic forms are more affordable. Consult your healthcare provider for personalized recommendations.