400 IU to mg
Instant conversion with safety verification based on WHO/NIH standards.
400 IU=268 mg
Based on Vitamin E Natural (1 IU = 0.67 mg)
Within the Tolerable Upper Intake Level (UL) of 1000 mg/day.
Conversion for All Applicable Substances
| Substance | 400 IU = | Factor | Safety |
|---|---|---|---|
| Vitamin E (Natural d-alpha-tocopherol)Primary | 268 mg | 1 IU = 0.67 mg | ✓ Safe |
| Vitamin E (Synthetic dl-alpha-tocopherol) | 180 mg | 1 IU = 0.45 mg | ✓ Safe |
| Insulin (Human) | 13.88 mg | 1 IU = 0.0347 mg | ✓ Safe |
How We Calculate
The conversion between International Units (IU) and weight units (mg) depends on the specific substance. Each substance has a unique conversion factor defined by international pharmacological standards (WHO/NIH).
Step-by-step for Vitamin E Natural
- Identify the conversion factor: For Vitamin E Natural, 1 IU = 0.67 mg.
- Multiply: 400 IU × 0.67 = 268 mg
- Verify safety: Within the Tolerable Upper Intake Level (UL) of 1000 mg/day.
400 IU × 0.67 = 268 mg
Quick Reference Table
Common IU to mg conversions for Vitamin E Natural. The current value is highlighted.
Related Conversions
Conversion factors sourced from NIH Office of Dietary Supplements, WHO 2026. Always consult a healthcare professional before making dosage decisions.