I have no idea what is HGH until I read it from the Internet. HGH stands for Human Growth Hormones, which is actually the hormone produced by the pituitary gland in the brain. Why some people need to get the HGH supplements? The answer is, because they want to look younger if comparing to their age. I think most of the artists took this, this is only my thought, I am not sure. However, some of the artists are taking some other stuff to make themselves look younger.