Growth hormone stimulates growth and cell reproduction and regeneration. Reported effects include decreased body fat, increased muscle mass, increased bone density, increased energy levels, improved skin tone and texture, increased sexual function and improved immune system function. At this time human growth hormone (HGH) is still considered a very complex hormone and many of its functions are still unknown. Effects of growth hormone on the tissues of the body can generally be described as anabolic (building up). 75 percent of your total daily HGH output is produced while sleeping, and most of that in REM sleep. GH starts to decline in the body as we grow older. After the age of 30 it declines by 25 percent every decade, so by the time you hit 60 you are operating at 25 percent of original capacity.
