Sieroń Adrian, Kołodyńska Gabriela, Rostojek Paulina. Potential advantages and disadvantages of using creatine supplements by professional volleyball players. Journal of Education, Health and Sport. 2018;8(8):1078-1087. eISNN 2391-8306. DOI http://dx.doi.org/10.5281/zenodo.1420119 http://ojs.ukw.edu.pl/index.php/johs/article/view/6009 The journal has had 7 points in Ministry of Science and Higher Education parametric evaluation. Part b item 1223 (26/01/2017). 1223 Journal of Education, Health and Sport eissn 2391-8306 7 © The Authors 2018; This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, 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: 02.08.2018. Revised: 12.08.2018. Accepted: 31.08.2018. Potential advantages and disadvantages of using creatine supplements by professional volleyball players Adrian Sieroń1, Gabriela Kołodyńska2, Paulina Rostojek3 1 Academy of Physical Education, Faculty of Physical Education, Department of Physical Anthropology 2 Academy of Physical Education, Department of Physiotherapy, Department of Physiotherapy in Internal Diseases 3 Academy of Physical Education, Faculty of Sport Science, a student of second degree Address for correspondence: Adrian Sieroń e-mail: adrian.sieron@op.pl Summary Creatine, a peptide built from three amino acids: arginine, glycine and methionine, is one of the most popular diet supplements used by people who train not only strength sports but also other popular disciplines, including team sports, i.a. volleyball. The benefits of creatine supplementation, such as weight, strength and muscle mass gain, are widely known, which translates directly into improved sports performance. However, is it really possible to consider such supplementation as a model solution for absolutely every athlete practicing volleyball? This brief review was intended to summarize the indications and effects of supplementation of volleyball players with creatine, taking into account the theoretical side of potential benefits, i.e. creatine metabolism in the creatine kinase (CK)-phosphocreatine (PCr) system and energetic advantages for muscle cells coming from the "renewing" of the basic useful energy carrier that is ATP (transferring the phosphate group to ADP) by creatine phosphate, as well as visual effects of training achieved in practice by volleyball players after supplementation with creatine, taken mostly in the form of monohydrate. This work also reviews possible potential side effects that are usually the result of exceeding the recommended dose of a supplement or taking preparations that are not subject to appropriate analytical tests, i.e. those who do not have appropriate certificates or attests. Keywords: Body, volleyball, supplementation, creatine