Autophagy and the Insulin like Growth Factor (IGF) System in Colonic Cells: Implications for Colorectal Neoplasia IGF = the most misunderstood underrated mechanism of growth. , Get it maxed out within a specific phase for a period of time, youll grow substantially. IGF 1 LR3 The Muscle Building Peptide Everyone's Talking About IGF 1 LR3 is one of the most powerful performance peptides used for muscle growth, recovery, and fat loss. It's a modified version IGF 1 LR3 The Muscle Building Peptide Everyone's Talking About IGF 1 LR3 is one of the most powerful performance peptides used for muscle growth, recovery, and fat loss. It's a modified version Normal or improved cardiovascular risk factors in IGF I deficient adults with growth hormone receptor deficiency ScienceDirect