Study concludes that there was no evidence to support vitamin D supplementation in the general population would improve COVID-19 outcomes.

Medical Mythbusting Commentary for June 3, 2021

Source:
High levels of vitamin D may not protect against COVID-19, study suggests

Reference:
Vitamin D and COVID-19 susceptibility and severity in the COVID-19 Host Genetics Initiative: A Mendelian randomization study

Bitnami