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Vitamin D and intervention trials in prostate cancer: from theory to therapy. Schwartz GG. Ann Epidemiol. 2009 Feb;19(2):96-102. Epub 2008 Jul 10. PMID: 18619854 doi:10.1016/j.annepidem.2008.03.007 This suggests that whereas vitamin D (e.g., cholecalciferol) might prevent prostate cancer, existing prostate tumors likely would require treatment with 1,25(OH)(2)D and/or its analogs. The major obstacle to the use of 1,25(OH)(2)D in patients therapeutically is the risk of hypercalcemia. Several maneuvers to reduce this risk, including pulse dosing and the use of less calcemic 1,25(OH)(2)D analogs, have been explored in Phase I-III clinical trials. Once merely a promise, vitamin D-based therapies for prostate cancer may soon be medical practice.

Effects of vitamin D supplementation on symptoms of depression in overweight and obese subjects: randomized double blind trial. Jorde R, Sneve M, Figenschau Y, Svartberg J, Waterloo K. J Intern Med. 2008 Dec;264(6):599-609. Epub 2008 Sep 10. PMID: 18793245 Conclusions. It appears to be a relation between serum levels of 25(OH)D and symptoms of depression. Supplementation with high doses of vitamin D seems to ameliorate these symptoms indicating a possible causal relationship.