The conversion of 1 IU (International Unit) to 0.667 mg is specific to a particular substance or medication. IU is a unit of measurement commonly used in the field of medicine and pharmacology to quantify the biological activity or potency of certain drugs, vitamins, or hormones.
The conversion factor of 1 IU to 0.667 mg is determined based on the specific substance being measured and its biological activity. It is not a universal conversion factor and can vary depending on the substance.
To accurately convert IU to mg, you would need to know the specific substance and its conversion factor, which is usually provided by the manufacturer or determined through scientific research and testing.