Vitamin D deficiency and the COVID-19 pandemic

This is the authors' abstract. We don't add key points for this paper.

• Vitamin D deficiency is very common. • Randomised controlled trials showed that vitamin D decreases acute respiratory infections (ARIs). • Vitamin D deficiency is an easily modifiable factor of ARIs. • Daily vitamin D supplementation with moderate doses is safe and cheap. • Even a small decrease in COVID-19 infections would easily justify this intervention.