A look inside the black market of human growth hormone. Does it live up to its claims?

Can HGH Really Help You Grow Muscle, Burn Fat, and Delay Aging?

Apparently, plenty of athletes and celebrities are already true believers. Ten to 15 men on each NFL team now use the banned substance, one player told the Milwaukee Journal Sentinel, and a prominent Los Angeles trainer estimates that 20 percent of actors take it, according to The Hollywood Reporter.

While only 45,000 Americans have a legitimate need for HGH, according to recent data analyzed by the Associated Press, twice that many prescriptions were dispensed in 2013, and that’s not counting the HGH that changes hands without a scrip.