How many iu to make 500 mg?

To convert milligrams (mg) to international units (IU), you need to know the specific substance's conversion factor, as it varies by compound. For example, for Vitamin D, 1 IU is equivalent to 0.025 mcg (micrograms), meaning that 500 mg of Vitamin D would equal 20,000,000 IU. However, for other substances, the conversion will differ, so it's essential to refer to the specific conversion factor for the substance in question.