The purpose of this study is to investigate the knowledge and awareness of dietary supplements among athletes in Universiti Pendidikan Sultan Idris (UPSI). Athletes (n=95, age: 22.5±2.4) completed a questionnaire on Google Docs regarding their habits and perceptions of dietary supplement intake. Among all respondents, 37 out of 95 (39%) took dietary supplements with the primary reason to improve energy (66%), strength (60%) or performance (59%). Athletes who did not take any supplement (58 out of 95; 61%) reported high supplement’s cost as their main reason (28%). The most chosen supplements are protein (43%), mass and strength gainer (19%), vitamin C (11%), energy booster, omega 3, and multivitamin (8% each), creatine, fat burner, vitamin B complex and BCAA (5%, each). The athletes believed that supplements are associated with health risk (75%), supplements can enhance performance (86%) and exercise increase the need for supplements (74%). They also believed that supplements can lead to positive doping results (61%), supplements are needed with a balanced diet (58%) and require more information provided on supplements (96%). The athletes reported that they stop consuming supplements when they are not in training season (71%). Majority of the athletes claimed that they have knowledge of the active ingredients contained in the supplements taken by them (41%), and they also reported that their coaches were their main source of information (59%). Although 66% of them agreed to obtain medical advice before consuming any supplement, there is still a need to develop a system whereby people involved in sports (especially coaches) should have deep knowledge about the different supplements and their effects. The source of knowledge is a critical step to avoid any misleading information, given that doping is a serious offence in competitive sports.