Participants were recruited through advertisement in online panels for the German-speaking weight-training and bodybuilding community. German, Austrian, and Swiss panels were provided with a web link to the survey, which took approximately 30 min to complete. Before starting the online survey, participants were informed about the study and its purpose. All participants took part on a voluntary and anonymous basis and were treated in accordance with the declaration of Helsinki. After completion of the survey, which was provided only in German language, participants were given the possibility to take part in a lottery with the chance of winning one of two 50 € vouchers for dietary supplements as an incentive.