Further doubt cast on benefit of vitamin D supplementation for disease prevention

A comprehensive review of the evidence suggests that low vitamin D levels are not a cause but a consequence of ill health, casting strong doubt on the value of vitamin D supplements to protect against acute and chronic disorders such as cancer, cardiovascular disease, diabetes, Parkinson's disease, and even death.

http://medicalxpress.com/news/2013-12-benefit-vitamin-d-supplementation-disease.html