Vitamin D crucial to activating immune defenses

The impact of vitamin D on regulatory T cells

T-cells really are the superstars in fighting COVID-19 - but why are some of us so poor at making them?

Vitamin D-Cathelicidin Axis: at the Crossroads between Protective Immunity and Pathological Inflammation during Infection

Human Cathelicidin Inhibits SARS-CoV-2 Infection: Killing Two Birds with One Stone

"it remains mysterious to me why we do not promote the widespread use of vitamin D - it is safe and it appears to be very effective for both preventing and treating SARS-CoV-2.”

Role of the T cell vitamin D receptor in severe COVID-19

Ferdinand Oeinck