Could supplementing with vitamin D reduce the risk of long Covid?

While supplementing with vitamin D may well help to reduce the risk of developing a Covid-19 infection and the subsequent Covid-related adverse outcomes, the role of the vitamin in long Covid is more uncertain. Although the recent JCEM study highlighted that low vitamin D levels were associated with long Covid, there is an urgent need for randomised trials to explore the possible value of supplementing with the vitamin as a means of attenuating this debilitating post-infection sequela.