claim: vitamin d determines severity in covid-19 so government advice needs to change , experts urge
evidence_1: this may be because vitamin d is important in regulation and suppression of the inflammatory cytokine response, which causes the severe consequences of covid-19 and 'acute respiratory distress syndrome' associated with ventilation and death.", "the authors propose that, whereas optimising vitamin d levels will certainly benefit bone and muscle health, the data suggests that it is also likely to reduce serious covid-19 complications.")