Prohibited substances in this class are considered Specified Substances and beta-blockers are only prohibited in competition for certain sports. Schools are required to provide drug education for student-athletes according to NCAA Bylaws. The use of anabolic-androgenic steroids and other performance-enhancing substances is strongly discouraged by the WIAA. Student-athletes should be aware that supplement products may contain banned substances that are not listed on the label. While stimulants are only banned in competition, the use of beta 2 selective substances is also prohibited except for specific exceptions. Creatine supplementation has unknown long-term consequences and is not recommended by the American College of Sports Medicine. DHEA and other anabolic steroids are also banned by the US FDA for testing purposes.