Coronavirus: How a lack of Vitamin-D affects your immunity

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People with darker skin often show dangerously low levels of the 'sunshine vitamin' and this can affect their ability to fight an infection such as Covid-19. John Watkins, a professor of epidemiology at Cardiff University, explains his findings and how food supplements should be recommended to people with a Vitamin D deficiency to boost their immune system. Photo: A woman squints at the sunshine Credit: Getty Images