What Is IGF-1?
The pituitary gland produces HGH more than any other hormone. Pituitary cells also called somatotrophin make HGH which is also known as somatotrophin. This is released into the blood for only a few minutes and then taken up into the liver where it is converted into growth factors. The most important of these is Insulin Growth Factor One (IGF-1). It is IGF-1 that is used as a measurement rather than HGH itself as to how much HGH is being secreted by the body and it is IGF-1 that is most directly responsible for the benefits mentioned on this site. Most HGH is secreted into the bloodstream in brief bursts, and most HGH secretion takes place during the early hours of REM (deep) sleep.
Once in the bloodstream, human growth hormone stays there for only a short time, only a few minutes, just long enough to stimulate its uptake into the liver, where it is then converted into growth factors. The most important of these growth factors is called IGF-1, short for Insulin-like Growth Factor-1. IGF-1 is also known as somatomedin C.
Growth hormone exerts its actions either directly or indirectly through its intermediary insulin growth factors (IGF-1) to every organ system of the body. Almost nothing escapes its magic touch. In the same ways that it grows the bones of young children, it increases the size of most organs and tissue. Even the brain is affected. The latest studies in animals show that it can regenerate damaged brain tissue.
It is IGF-1, rather than growth hormone itself, which can vary widely through the day, that is used as a measurement of how much growth hormone is being secreted by the body. IGF-1 is directly responsible for most of the benefits and actions associated with HGH. IGF-1 is 10 times more potent than human growth hormone and is now under investigation as a separate drug for many of the same indications of human growth hormone. Phil Micans of International Aging Systems in London believes that IGF-1 will be the hormone of choice in a few years