IGF-1 – insulin-like growth factor, a hormone secreted in the liver, which owes its name to the structural similarity to insulin. Its synthesis stimulates the presence of the growth hormone, with which it works synergistically.
IGF-1 stimulates the synthesis of proteins, causing the occurrence of new tissues and the development of the present ones. It is an incredibly important factor stimulating ontogenetic development of a human being and its deficiencies are related to dwarfism. It also has positive influence on regeneration of tissues in adults, thanks to which it positively influences their nourishment and functionality.
Direct application of IGF-1 is practically unheard of due to the problem with its availability and health matters. For the stimulation of its secretion, anabolic-androgen steroids are used, which are conducive to the synthesis of IGF-1 factor (although it is certainly a highly dangerous activity). A much safer option are dietary supplement, the application of which is conducive to the synthesis of insulin-like growth factor.
On the market of supplements supporting muscle gain, there are also products containing IGF-1 in the form of creams or gels for topical application.