IGF1 - Insulin-like Growth Factor - is a naturally occurring hormone like insulin. A small increase in IGF-1 can have a very big effect on your muscularity.
HGH stimulates the liver to produce IGF-1. Bursts of IGF-1 stimulate cell growth and muscle cell regeneration. IGF-1 promotes cell growth in muscle, skin, liver, bone, lungs, kidneys, and nerves.
Increased IGF-1 levels in the blood can help you not only recover faster, but also stronger.
IGF-1 and Anti-Aging
Growth hormone (HGH) levels typically drop substantially as you age. It's not unusual to see drops of 80% over the 40 years from age 20 to age 60. When the level of HGH drops, IGF-1 levels also drop. Without IGF-1, age related muscle, bone, and skin degeneration occurs.
Did you know, HGH can also help speed healing after surgery. I used it to augment my physical therapy regimen after rotator cuff surgery. Here's how Sandy Shaw worked to speed healing her broken foot. Shaw in effect created a growth hormone therapy based on naturally stimulating the release of HGH. See Effects of Growth Hormone for how she did it.