Also known as: IGF1 LR3: Long R3 IGF-1, Insulin-Like Growth Factor, I LR3 & IGF 1. IGF1 mitigates many of the growth promoting effects of growth hormone. Research studies have shown that IGF-1 causes muscle cell hyperplasia, which is a splitting and forming of new muscle cells therefore increasing muscle cell density.
IGF-1 is a peptide which has a similar structure as insulin. It is in the peptide family of substances known as growth factors. In the body, IGF-1 is released in the presence of Human Growth Hormone. Although growth hormone is considered to be highly anabolic, in actuality, IGF-1 is suspected to be responsible for the primary muscle growth activities of growth hormone.