Even versions of Zi Xiu Tang Bee Pollen labeled "genuine" and "anti-counterfeit" have been found to contain the drug sibutramine, which was supposed to come off the U.S. market in 2010 for safety reasons. Food and Drug Administration hide caption

itoggle caption Food and Drug Administration

Yankees third baseman Alex Rodriguez in September of 2013 in Baltimore, Maryland. Patrick Smith/Getty Images hide caption

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Alex Rodriguez of the New York Yankees, playing for the Yankees' minor league affiliate Charleston RiverDogs, runs to first base during a game in July 2013. Streeter Lecka/Getty Images hide caption

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American cyclist Chris Horner celebrates winning Spain's Vuelta bicycle race Sunday. Anti-doping officials say that Horner, who at 41 is the oldest ever to win one of cycling's top events, was not at the hotel drug testers visited. Jaime Reina/AFP/Getty Images hide caption

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Belgian Blue bulls look like they are made of muscle because they have a mutation in the gene that codes for the protein myostatin. In humans, as in other types of cattle, myostatin normally limits the number of muscle fibers that form before birth and then limits the growth of those fibers later on. Courtesy of Se-Jin Lee and Alexandra McPherron/PNAS hide caption

itoggle caption Courtesy of Se-Jin Lee and Alexandra McPherron/PNAS

Ryan Braun of the Milwaukee Brewers has been suspended for the rest of the 2013 season after violating Major League Baseball's drug policy. Mike McGinnis/Getty Images hide caption

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Dark clouds hang over Major League Baseball. There are reports that about 20 players may be suspended because of their connections to a Miami clinic that dispensed performance-enhancing drugs. (Photo taken Sunday at Yankee Stadium.) Jason Szenes /EPA /LANDOV hide caption

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Major League baseball will begin random regular-season blood tests for human growth hormone, seen here in an injector pen holding about one week's worth of HGH doses at the clinic of Dr. Mark Molitch of Northwestern University. M. Spencer Green/AP hide caption

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Lance Armstrong competes in the Ironman Panama 70.3. triathlon in Panama City, Panama. Arnulfo Franco/AP hide caption

itoggle caption Arnulfo Franco/AP