维生素 E · 单位换算
先选择标签注明的化学形式，再选择换算方向。未选择形式则不给出结果：同一 IU 数值在不同形式下对应的质量不同。
结果
请先选择形式。IU 不是质量单位，未确定形式即不存在可依据的系数。
本页使用的系数
| 形式 | 从 | 到 | 系数 | 来源 | 年份 |
|---|---|---|---|---|---|
| d-alpha-tocopherol, natural (vitamin E) | IU | mg | 0.67 | Vitamin E - Health Professional Fact Sheet (NIH Office of Dietary Supplements) | 未注明年份 |
| dl-alpha-tocopherol, synthetic (vitamin E) | IU | mg | 0.45 | Vitamin E - Health Professional Fact Sheet (NIH Office of Dietary Supplements) | 未注明年份 |
来源原文
To convert from IU to mg: 1 IU of the natural form is equivalent to 0.67 mg of alpha-tocopherol. [Labelling convention — a rounded figure (approx. 2/3), the reciprocal of 1.49 IU/mg; independently confirmed in FDA's guidance Table 6 for 'Natural vitamin E (RRR-alpha-tocopherol) including its ester forms (RRR-alpha-tocopheryl acetate and RRR-alpha-tocopheryl succinate)' at the same 0.67 value.]
Vitamin E - Health Professional Fact Sheet (NIH Office of Dietary Supplements)
1 IU of the synthetic form is equivalent to 0.45 mg of alpha-tocopherol. [Labelling convention — rounded reciprocal of 2.22 IU/mg; independently confirmed in FDA's guidance Table 6 for 'Synthetic vitamin E (all-rac-alpha-tocopherol) including its ester forms' at the same 0.45 value.]
Vitamin E - Health Professional Fact Sheet (NIH Office of Dietary Supplements)