How do you convert vitamin D IU to mg - Answers - The Most Trusted Place for Answering Life's Questi
15 I.U. Vitamin E = 10mg, so 400 I.U. would =266.67 mg. (400/15x10=266.67). The World Health Organization sets the I.U. (International Units) for some medications, and vitam … ins, each of these has a different I.U. to mg ratio, and you have to find a ref...