
Originally Posted by
Youthful55guy
We measure IGF-1 because it's a relatively stable and easy to measure marker for GH release. The end goal is really to increase GH secretion, but GH is episodic and diurnal in it's release, so it's more difficult to measure. Therefore, we use IGF-1 as a segregate marker for GH. The hormone affects the production many other growth factors and processes in the body, all of which decline with age as the master hormone (GH) declines. If we can boost GH to more healthy levels, as they were when we were in or 20's or 30's, in theory, we should be able to improve on the age-related decline we see in our bodies as we get older.
So, injecting IGF-1 may be beneficial to some processes such as muscle and joint repair, but it's like a single trumpet play in a symphony of hormones and growth factors.