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Vitamin D is the rising star of the supplement world, following research linking low levels to a number of diseases including bowel cancer, multiple sclerosis, diabetes and Alzheimer's. And now it’s in the headlines again – it claims that supplements can help ward off coughs, colds and flus. Dr Mark Porter and Dr Margaret McCartney take a look at the study that generated the headlines.

First broadcast on Inside Health, 22 February 2017.