Öz
This study aims to conduct reliability and validity studies of sports supplement belief scale for students in sport sciences. The scale adaptation method of research design was used. The research was conducted on two different study groups. The first working group, consisting of 76 people, represents the target value for which the exploratory factor analysis was conducted. One hundred forty university students were recruited in second study group. Data collected with the translated version of the Sports Supplement Belief Scale. In the study, a linguistic equivalence study was carried out, and it was determined that the correlations between the items in Turkish and the original form varied between 87 and 95. Attitude Factors Towards Sports Supplement scale was used for criterion-related validity. Exploratory, Confirmatory Factor Analysis and convergent and divergent validity methods were used for validity in the study. Exploratory and Confirmatory Factor Analysis was used for validity, while Cronbach's Alpha internal consistency coefficient was calculated for reliability. The scale was unidimensional and contributed to total variances at 69,379%. The fit indexes calculated after confirmatory factor analysis was at a good and acceptable level, as indicated in the literature. Convergent validity and its consequences; AVE>,5; Results were obtained as CR>,7 and CR>AVE, and for divergent validity, MSV < AVE, ASV < AVE. Cronbach's Alpha was ,912, indicating that the scale was reliable when compared with values in the literature. According to item analysis results, item-total correlations of sports supplement belief scale ranged between ,819 and ,614. Moreover, significant differences were found between the upper and lower 27% groups. It has been concluded that the sports supplements belief scale is a valid and reliable measurement tool for use in students studying in sports sciences.