Vitamin A: One international unit (IU) equals 0.3 mcg of retinol or 0.6 mcg of beta-carotene.It was determined that 0.3 mcg of retinol or 0.6 mcg of beta-carotene are equivalent in terms of their biologic activity and each respective strength is assigned one international unit. Tests have shown that different strengths of these 'vitamin A' forms are needed to have the same biological activity (i.e. For one example, take vitamin A, which is available in multiple forms, including: In a nutshell, international units are used as a method of standardizing different forms of the same substance, thus, making them easier to compare in terms of their biological activity. The topic of international units and its use on labels, instead of the more commonly recognized metric unit of measure (e.g milligrams), often leads to confusion. I discuss this more in the next sections. It is not measured in international units, ever. There are are a variety of strengths available for over the counter vitamin D products (vitamin D 2 and vitamin D 3), and their strength can be labeled variously as micrograms, milligrams, or international units.Ĭalcitriol, on the other hand, is technically considered a vitamin D 'analog'. We didn't however, touch on a calcitriol conversion to international units, but for good reason. We wrote a recent article on the subject of converting units of vitamin D to both micrograms and milligrams. What is the equivalent of calcitriol 0.25 mcg in international units for vitamin D3? Thank you Answer
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