Andrew Huberman· PhD
there's another hormone called igf-1 or insulin growth factor one which is produced by the liver insulin growth factor 1 does many things similar to growth hormone and it actually is Rel in response to growth hormone so basically the way this works is that there's a signal that comes from the hypothalamus called growth hormone relasing hormone and then that signal stimulates the anterior pituitary to release growth hormone growth hormone then is circulated throughout the blood it also can access the brain itself and it does different things in different tissues but again increases ATP production for energy it is going to cause tissue repair in some cases it's also going to encourage growth of tissues not just muscles but other tissues that's why it's involved in helping us achieve our full height our full stature when growth hormone reaches the liver it stimulates the release of igf-1 which in turn does a number of things that are both synergistic and different that is it works both similarly to growth hormone and does some things in parallel that are a little bit different as well in particular things related to regulation of blood sugar metabolism Etc all things associated with kind of youthfulness Vitality and energy