When choosing supplements, athletes should consider factors such as dietary needs, specific performance goals, and potential side effects. They must evaluate the safety and efficacy of products backed by scientific research and check for third-party testing to ensure quality. Additionally, athletes should be aware of legal regulations, especially regarding banned substances in competitive sports. Personal health history, including allergies and pre-existing conditions, should also be a priority, along with consulting with a nutritionist or sports doctor before adding supplements to their routine.