According to the report, Major League Baseball issued a warning to players last week that the deer-antler spray contains "potentially contaminated nutritional supplements" and had been added to the league's banned list of products. One of the chemical elements of the deer-antler spray -- IGF-1, or insulin-like growth factor -- can not be detected in the tests dictated by the sport's Joint Drug Prevention and Treatment Program.
IGF-1 is considered a performance-enhancer, and SI.com reported that it is used to mediate the level of human growth hormone in the body. The report also said that the chemical is considered a performance-enhancer and that its use has been banned by baseball and by the World Anti-Doping Agency.
The manufacturers of the spray highlight "anabolic or growth stimulation", "athletic performance" and "muscular strength and endurance" as some of the possible benefits from its use. The SI.com report said MLB told players that the spray can cause a positive test for the steroid methyltestosterone.
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.