Mechano Growth Factor, better known as MGF, is a splice variant of Insulin-Like Growth Factor-1 (IGF-1). This hormone is largely responsible for the healing and building of damaged muscle tissue post exercise or any other activity that causes damage to the muscle tissue. Although somewhat simplistic to say, the best way to view MGF is as a byproduct of IGF-1, specifically, IGF-1Ec, which represents the predominant splice in the two splice system created by IGF-1.
IGF-1 is a hormone consisting of 70 amino acids that is structurally similar to insulin. Produced by the liver, IGF-1 production is stimulated by the production and release of Growth Hormone (GH) in the body. IGF-1 affects nearly every cell in the human body, predominantly as it pertains to cellular repair. When muscle tissue is damaged, this creates a response in the body that causes IGF-1 to be spliced into two variants, IGF-1Ec and IGF-1Ea, the former being MGF.