Editor’s choice: vitamin D

Vitamin D has gained widespread attention during the COVID-19 pandemic, but there's more to this molecule than its effect, or lack thereof, on COVID infection outcomes. Aside from its key role in skeletal metabolism, vitamin D may affect other aspects of health including cardiovascular, neurological, and reproductive. This Collection brings together new research exploring these associations and the mechanisms underlying them, as well as studies informing the delivery and measurement of vitamin D.