1. Patricia Marian Dillavou Patricia Marian Dillavou United States says:

    The idea that 1,000 IU a day would prevent any cancer is laughable.  That won't even maintain proper bone and muscle health.  This study published in the AntiCancer Research Journal in February of 2011 showed that it required a minimum of 8,000 IU daily to prevent most cancers.  Whether or not this amount addresses colorectal cancer isn't even the point.  The point is that cancer studies with IU's in greatly sub-optimal amounts are pointless.

    Vitamin D Supplement Doses and Serum 25-Hydroxyvitamin D in the Range Associated with Cancer Prevention

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