{Reference Type}: Journal Article {Title}: Vitamin D supplementation and calcium: Many-faced gods or nobody in fighting against Corona Virus Disease 2019. {Author}: Roohi A;Gharagozlou S; {Journal}: Clin Nutr ESPEN {Volume}: 62 {Issue}: 0 {Year}: 2024 Aug 暂无{DOI}: 10.1016/j.clnesp.2024.05.015 {Abstract}: In December 2019, Corona Virus Disease 2019 (COVID-19) was first identified and designated as a pandemic in March 2020 due to rapid spread of the virus globally. At the beginning of the pandemic, only a few treatment options, mainly focused on supportive care and repurposing medications, were available. Due to its effects on immune system, vitamin D was a topic of interest during the pandemic, and researchers investigated its potential impact on COVID-19 outcomes. However, the results of studies about the impact of vitamin D on the disease are inconclusive. In the present narrative review, different roles of vitamin D regarding the COVID-19 have been discussed to show that vitamin D supplementation should be recommended carefully.