By Susan Lanham-new in The Conversation.
Most people know that it’s important to get enough vitamin D. Among other things, it’s vital for bone and muscle health. What people may not know is that there are two types of vitamin D: vitamin D2 (found in plant-based foods) and vitamin D3 (found in meat and fish).
The public haven’t had to worry about this distinction because nutritional scientists have been telling us for years that both forms of the vitamin are “biologically equivalent”. In other words, a given dose of vitamin D2 or D3 will raise blood levels of vitamin D by the same amount. However, our latest study shows that this is not the case.
We have discovered that, compared with vitamin D2, vitamin D3 is twice as effective at raising levels of the vitamin in the body, when given at recommended daily doses. This finding means that a lot of health guidelines will need to be rewritten as many claim that the two forms of vitamin D are equivalent.
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