Serum Vitamin D Concentration and Prostate Cancer Risk: A Nested Case-Control Study.
J Natl Cancer Inst. 2008 May 27.
Conclusion. The findings of this large prospective study do not support the hypothesis that vitamin D is associated with decreased risk of prostate cancer; indeed, higher circulating 25(OH)D concentrations may be associated with increased risk of aggressive disease.
Wide seasonal fluctuations of vitamin D may be more important - Vitamin D supplementation should be consistent: researchers