Vitamin D’s most well known function is to regulate bone metabolism and the concentration of calcium in the bloodstream. However, in recent years, it has been thrust into the spotlight as a potential immuno-modulator. In the context of the corona virus pandemic, this has led to speculation about whether we should all be taking vitamin D supplements to protect us against such infections.

I decided to join Dr Tom O’Bryan and The Nutrition Collective last week to review what the science says on vitamin D, immunity and supplementation.