IGF-1LR3 (Insulin-like growth factor-1) is a hormone that is produced primarily by the liver and also in target tissues in a paracrine/autocrine fashion. The main role of IGF-1 is to promote cell growth and division. It is involved in cell repair, especially in the brain, heart and muscle. IGF-1 LR3 will travel through the body for approximately one day, binding to receptors and activating cellular communication that promotes muscle mass growth and bodyfat loss.
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