We only found one successful randomized controlled trial of vitamin D supplementation with respect to cancer incidence.
In a study involving post menopausal women living in Nebraska, those taking 1100 IU/day of vitamin D3 and 1450 mg/day of calcium had a 77% reduction in all-cancer incidence between the ends of the first and fourth years, while those taking only the calcium had a 40% risk reduction.
From those results, it was concluded that the vitamin D supplementation reduced the all-cancer incidence rate by 35%1.
Page last edited: 22 August 2011
- Lappe, J.M. Travers-Gustafson, D. Davies, K.M. Recker, R.R. Heaney, R.P. Vitamin D and calcium supplementation reduces cancer risk: results of a randomized trial. Am J Clin Nutr. 2007 Jun; 85 (6): 1586-91.