The Insulin-like Growth Factor is one of the endocrine hormones that is produced in the liver.

The release of this hormone increases in the presence of Human Growth Hormone. Numerous cells throughout the muscles of the human body are equipped with cell receptors that have a high affinity for Insulin-like Growth Factor.

This makes this hormone one of the best growth hormones and a facilitator of general cell growth which it does by targeting different specific tissues and in more autocrine cell communication processes, it facilitates cell division.