“In addition to changing some DVs, the proposed rule would change the units used to declare vitamins A, E, and D from international units, or I.U. Per the Food Labeling: Revision of the Nutrition and Supplement Facts Labels: Among other things, they will require the strength of vitamin A, D and E to be listed as a metric measure. New dietary supplement labeling requirements from the FDA will go into full effect by January 2021. ![]() Starting in 2021, the International Unit will no longer be the only strength listed on vitamin D supplements. One dose of vitamin D3 lasts longer but you should take 50,000 IUs of vitamin D no greater than one month apart. A dose of 50,000 IUs of vitamin D2 should be taken at intervals no greater than three weeks because the blood levels wane. Some online sources that do not require a prescription may supply vitamin D3. ![]() Note that the prescription strength of 50,000 IUs is vitamin D2.
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