Low serum vitamin D levels and tuberculosis: a systematic review and meta-analysis.

By K. Nnoaham, A. Clarke. International Journal of Epidemiology, 2008

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The nonskeletal effects of vitamin D: an Endocrine Society scientific statement. (2012, background): “Another RCT studied added vitamin D to ongoing calcium supplementation in 302 women; the primary endpoint was risk of falls (209).”
Vitamin D: modulator of the immune system. (2010, background): “Moreover, hypovitaminosis D is associated with an increased risk of multiple malignancies, metabolic and cardiovascular diseases, and immune disorders such as autoimmune diseases and high infection rates [6–10].”
Vitamin D—Effects on Skeletal and Extraskeletal Health and the Need for Supplementation (2013, background): “93), representing a medium to large effect [209].”
Update in vitamin D. (2010, background): “tuberculosis infection rates (effect sizes) in humans; compared with matched control subjects from the same population, patients with active tuberculosis possessed significantly lower serum 25OHD levels (24).”