September 13, 2022
Early in the COVID-19 pandemic, some research suggested that vitamin D deficiency could contribute to exacerbated systems of COVID-19, similarly to how a deficiency contributes to other respiratory illnesses. These studies lead to speculation that vitamin supplementation could be a potential useful treatment or preventative measure. Two recent, strong research studies featured in BMJ, however, indicated that vitamin D supplementation appears to have no effect on incidence of COVID-19, as summarized in a BMJ editorial.
Both studies, one based in the UK and one based in Norway, highlight the important role that vitamin D plays in mediating response to various respiratory illnesses, but the unique, multisystem nature of COVID-19 seems to stymy the effect. The ongoing research provides evidence that vitamin D may join hydroxychloroquine and ivermectin as proven ineffective agents to prevent or lessen COVID-19.