How do I convert international units (IU) to milligrams?
The majority of the time fat soluble vitamins are listed in international units (IU). On rare occasions, they may appear in metric units, which throws everyone for a loop. Once you know the equivalents, it's fairly simple to convert IU to mg, then all you need is pen and paper.
1 IU = 0.735 mg d-alpha Tocopheryl Acetate
1 IU = 0.671 mg d-alpha Tocopherol
1 IU = 0.861 mg d-alpha Tocopheryl Succinate
1 IU = 1 mg dl-alpha Tocopheryl Acetate
1 IU = 0.91 mg dl-alpha Tocopherol
Vitamin A Acetate
1 IU = 0.344 mcg
1 IU = 0.025 mcg
40 IU = 1 mcg