Vitamin D3 8000 IU - 200 Tabs - High Strength Cholecalciferol - Immune Support | eBay
Nutritional risk of vitamin D, vitamin C, zinc, and selenium deficiency on risk and clinical outcomes of COVID-19: A narrative review - Clinical Nutrition ESPEN
Frontiers | A Basic Review of the Preliminary Evidence That COVID-19 Risk and Severity Is Increased in Vitamin D Deficiency
Nutritional risk of vitamin D, vitamin C, zinc, and selenium deficiency on risk and clinical outcomes of COVID-19: A narrative review - Clinical Nutrition ESPEN