Congress reviews law on dietary supplementsRaids were conducted on several companies suspected of making bodybuilding products that illegally contain steroids and are sold as over-the-counter dietary supplements by the federal agents.

The FDA has, meanwhile, issued a warning to consumers not to make use of products marketed as bodybuilding products and containing steroids or that claims to enhance testosterone.

Travis T. Tygart, chief executive of the United States Anti-Doping Agency, said many companies are exploiting the lack of premarket regulation to sell magic powders and pills while using reputation of the health food industry to cloak themselves with the appearance of respectability and safety.