As 2015 closes, Peyton Manning gas become embroiled over allegations his wife received prescription human growth hormone.
Growth hormone is not a steroid.
It is banned by all the agencies that govern sports doping because it provides an unfair advantage.
Unlike steroids, administered correctly, growth hormone is safe
So, in addition to designer analogs and steroids, the other drug that provide an unfair advantage to athletes is human or recombinant growth hormon
There are also many others that are not yet banned because they remain unknown.
These unkown compounds are not detected in doping tests so their use can’t be proved.
One very difficult PED to detect is growth hormone.
The rational for abuse of growth hormone is based on studies that demonstrate, at least in growth hormone-deficient males, that growth hormone stimulates fat loss and increases skeletal muscle size and strength.
A new method to increase growth hormone levels in athletes, one that is perfectly legal and healthy, is to increase them through dietary supplements that contains a combination of four amino acids: arginine, ornithine, lysine, and tryptophan.