Insulin-like growth factor 1 (IGF-1) is a primary mediator of the effects of growth hormone (GH) and has growth-promoting effects on almost every cell in the body. IGF-1 can also regulate cell growth and development, especially in nerve cells, as well as cellular DNA synthesis. Turkey IGF-1 Recombinant Protein is purified insulin-like growth factor 1 (IGF-1) produced in yeast.