Look for the mark and you'll find a safer product.
The NSF Prohibited Substances List includes all banned substances identified by leading sports organizations, such as the World Anti-Doping Agency (WADA), the National Football League (NFL) and Major League Baseball (MLB). The NSF Athletic Banned Substances Certification Program certifies products and inspects facilities for a range of substances, including:
The banned substances list will be updated regularly through input from regulators, industry and consumer groups in the international sports community. The specific list is located in Annex A of the NSF Athletic Banned Substances Guideline-306-2005.