Vitamin D thread -Please use this for your Vit D info.

[bmorr7]

Thank you so much for all the posts here on vitamin D. It looks like all of the studies have shown that a low vitamin D level is associated with poorer outcomes for cancer patient. Is it possible that the vitamin D levels are low because these patients have more aggressive cancers which "use up" the vitamin D. In other words, is the low vitamin D a result of the worse cancer or does it increase the risk of more cancer? I guess the only way to know for sure would be to do a randomnized study of cancer patients where half the patients received vitamin D and the other half a placebo. Is anyone aware of a study like that?