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Recent headlines have suggested vitamin D deficiency could increase the risk of dying from COVID-19, and in turn, that we should consider taking vitamin D supplements to protect ourselves. Is this all just hype, or could vitamin D really help in the fight against COVID-19? At least in theory, there may be something to these claims. Nearly all immune cells have vitamin D receptors, showing vitamin D interacts with the immune system. The active vitamin D hormone, calcitriol, helps regulate both the innate and adaptive immune systems, our first and second lines of defence against pathogens. And vitamin D deficiency is associated with immune dysregulation, a breakdown or change in the control of immune system processes. We still have relatively little direct evidence about the role of vitamin D in COVID-19. And while early research is interesting, much of it may be c
