“… cholecalciferol (vitamin D 3) is substantially more potent than ergocalciferol (vitamin D2).” ‘Vitamin D in Health and Disease’ Heaney, RP.Vitamin D2 is one of these vitamins that is not very bioavailable, yet this is the ONLY form used in the Vitamin D 50,000 IU pills that you will get from EVERY pharmacy!! The Vitamin D Research supports this extremely well: Many vitamins are not necessarily bioavailable, therefore taking vitamins does not mean that you actually ABSORB the vitamin. This is a phenomenon called bioavailability- or in this case simply Vitamin D Absorption. So what's the difference? Vitamin D is Vitamin D, right? And a PRESCRIPTION is going to provide a form with the best Vitamin D absorption and the best quality, right? Unfortunately, no.īut it is a far inferior form of Vitamin D that does not get absorbed into the body well. Many over the counter Vitamin D supplements and ALL prescription Vitamin D supplements contain Vitamin D2. It was used, and still is in many cases, to fortify foods, make some Vitamin D supplements and is the basis for ALL Prescription Vitamin D. Vitamin D2 was the first synthetic form of Vitamin D and is the form of vitamin D in almost all Vegan Vitamin D supplements. Vitamin D2, also called ergocalciferol and Vitamin D 3, also called cholecalciferol. Disease prevention from Vitamin D is very much affected by which type of Vitamin D that you are taking. Vitamin D comes in two different formulations. Vitamin D3 vs Vitamin D2 Are You Getting the Right One?
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