Originally Posted by kiwi33

I am curious about your evidence for this.

To quote from the Abstract of a recently meta-analysis of clinical trials looking at the possible benefits of Vitamin D supplementation:

"The effect estimate for vitamin D supplementation with or without calcium for [...] cancer (seven trials, 48 167 patients) [...] lay within the futility boundary, indicating that vitamin D supplementation does not alter the relative risk of any of these endpoints by 15% or more." The source of this quote is http://www.thelancet.com/journals/la...212-2/abstract .

What the authors concluded from their analysis was that vitamin D supplementation for 48167 (a big number!) cancer patients provided no statistically significant improved clinical outcomes.

Would you like to comment on this?