Nickan Research Institute Journal of Renal Endocrinology 2423-6438 7 1 2021 01 01 Vitamin D and COVID-19 infection; recent findings e19 e19 10.34172/jre.2021.19 EN Alireza Pouramini https://orcid.org/0000-0003-0245-8552 Fatemeh Kafi https://orcid.org/0000-0001-5993-7736 Shakiba Hassanzadeh https://orcid.org/0000-0002-5091-5191 Journal Article 10.34172/jre.2021.19 2021 07 16 2021 09 15 COVID-19 infection increases the risk of death in patients with chronic conditions such as diabetes or obesity. The exact role of vitamin D in COVID-19 infection is unknown and controversial. Furthermore, the exact prevalence of vitamin D deficiency is still unknown but it affects individuals worldwide regardless of ethnicity and age. Herein, we give an overview of vitamin D deficiency as a global public health problem, the role of vitamin D in COVID-19 infection, and the proper approach to treating vitamin D deficiency.