Athletes must be familiar with WADA'S Prohibited List (Prohibited List | World Anti Doping Agency) which is a list of prohibited substances and methods in sports that is updated once a year. With this list, it will allow athletes to cross check the ingredients of their medications or supplements to ensure that it does not contain any prohibited substances.
Another method to check a medication or supplements ingredients is by visiting Global DRO - Home.
Examples of prohibited substances are such as: