Growth Hormone For Enhanced Muscle Growth If you are interested in building maximum amounts of muscle mass, then the chances are, you have came across what is known as the peptide hormone: growth hormone. Well, it's good if you have because when it comes to maximising your muscle gains, growth hormone is a pretty big deal! Simply put, growth hormone is released by a structure in the brain called the pituitary gland. Once growth hormone is released, it stimulates the liver to produce IGF-1 (insulin-like growth factor 1). IGF-1 has a multi functional role in the body, with one...