Tag: Vitamin conversion chart

According to the National Institutes of Health, the conversion between milligrams (mg) and International Units (IU) is not standardized and varies significantly depending on the substance. This means asking how many IU is 450mg requires knowing which specific vitamin or compound you are referring to, with a common example involving Vitamin E.

The conversion from International Units (IU) to micrograms (mcg) is not universal; for example, 1000 IU of vitamin D equals 25 mcg, but 1000 IU of vitamin A is approximately 300 mcg RAE. This critical difference means you must know the specific substance before attempting a conversion. This guide breaks down the essential conversions to ensure you can accurately interpret your vitamin and supplement labels.