"Deer antlers? Yes, chemists have figured out that the velvet from immature deer antlers includes insulin-like growth factor, or IGF-1, which mediates the level of human growth hormone in the body, and is also banned by MLB and the World Anti-Doping Agency, among others, for its muscle-building and fat-cutting effects."
http://sportsillustrated.cnn.com/201...#ixzz1UBmAdHCt