How many iu equals 70 mg?

To convert milligrams (mg) to international units (IU), you need to know the specific substance's conversion factor, as different substances have different potencies. For example, 70 mg of vitamin E is approximately 104 IU, while 70 mg of vitamin D is about 2800 IU. Without knowing the specific substance, it's not possible to provide a direct conversion from 70 mg to IU.