DudzińskaWioletta, Chilińska Oliwia, Warias Paulina, Maskiewicz Paulina,Maniak Eliza, StrońskaAleksandra. The role of vitamin D in the human body and the influence of vitamin D on the proliferation of cancer cells.Journal of Education, Health and Sport. 2021;11(5):33-43. eISSN 2391-8306. DOI http://dx.doi.org/10.12775/JEHS.2021.11.05.003 https://apcz.umk.pl/czasopisma/index.php/JEHS/article/view/JEHS.2021.11.05.003 https://zenodo.org/record/4755989 The journal has had 5 points in Ministry of Science and Higher Education parametric evaluation. § 8. 2) and § 12. 1. 2) 22.02.2019. © The Authors 2021; This article is published with open access at Licensee Open Journal Systems of Nicolaus Copernicus University in Torun, Poland Open Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author (s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non commercial license Share alike. (http://creativecommons.org/licenses/by-nc-sa/4.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited. The authors declare that there is no conflict of interests regarding the publication of this paper. Received: 21.04.2021. Revised: 26.04.2021. Accepted: 13.05.2021. The role of vitamin D in the human body and the influence of vitamin D on the proliferation of cancer cells Wioletta Dudzińska1, Oliwia Chilińska2, Paulina Warias2, Paulina Maskiewicz2, ElizaManiak2, Aleksandra Strońska3 1Institute of Biology, University of Szczecin, Felczaka 3c, 70-215 Szczecin, Poland 2Student Research at the Science Club of Biotechnology, University of Szczecin, Poland 3Department of Pharmacognosy and Natural Medicines, Pomeranian Medical University in Szczecin, Powstańców Wlkp. 72, 70-111 Szczecin, Poland ABSTRACT The publication focuses on the presentation of the role of vitamin D3 in the human body. The content contains important information on the influence of vitamin D3 on the course of Covid-19 disease caused by the Sars-Cov-19 virus. Cholecalciferol has been studied for years. Its basic functions include the regulation of bone mineral metabolism and calcium-phosphorus metabolism. In addition, the publication characterizes the course of vitamin D3 synthesis and presents the important role of vitamin D3 in the body. Additionally, the currently conducted research in terms of anti-cancer properties of selected vitamin D3 analogues was described. Key words: Covid-19; Human physiology; cancer; Vitamin D