Vitamin D could be a piece of COVID-19's 'complex puzzle,' Israeli scientists say, after a new study finds a link between deficiency and severe illness
- Low levels of vitamin D prior to catching COVID-19 were linked to worse illness, a study found.
- Vitamin D helps bolster the immune system to tackle viruses that attack the lungs, researchers said.
- Vitamin D is "one piece of the complex puzzle" underlying severe COVID-19, the scientists cautioned.