There is a lot of hype out there about the great things that the human growth hormone can do. Some people think of it as the fountain of youth. But what people don't make a big deal about is the fact that there are side effects. It use to be that HGH could only be given by a doctor upon prescription, but these days there are many products on the market, most of which are not pure, that are available to the public. As with any pill, it is important to know the side effects. When used improperly, HGH can cause thyroid damage, liver damage, heart enlargement, and premature death. It is extremely important to consult with a doctor before taking any HGH products.