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: Vitamin D3 is generally more effective at raising and maintaining your blood levels of Vitamin D than D2.

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The supplement industry isn't strictly regulated, so quality varies between brands. : Vitamin D3 is generally more effective at

: Most labels use International Units (IU), but some use micrograms (mcg). For reference, 400 IU is equal to 10 mcg. Common daily doses range from 600 to 2,000 IU, though some may require more based on a healthcare professional's advice . 5. Watch for Fillers how to buy vitamin d