10 Apr 2020 --- Conscious that no single supplement, vitamin or food can treat or prevent COVID-19, global scientists are exploring the role that vitamin D supplementation can play in reducing the risk of respiratory infection, in general. Because vitamin D deficiency (VDD) is associated with increased risk of acute viral respiratory infection, it may offer an extra avenue of increasing resistance, with some researchers now calling for “urgent supplementation” in vulnerable groups. NutritionInsight explores to what extent recent research may present opportunities for the sunshine vitamin.