Vitamin D controversy
There is increasing controversy over the role of Vitamin D supplementation, lead by recently published research. Concerns relate to what really is the optimal level of Vitamin D in the body, and to the claimed outcomes from having such a level. Its generally agreed that Vitamin D supplementation is helpful for older patients at risk of falls, so as to decrease the risk of bone fracture in case of a fall. Other outcomes, such as claimed improved immunity, maybe spurious.
For more information, refer to this article from The Age.