IGF 1 LR3 Cycle: What to Expect The Peptide Report IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society IGF 1 promotes cell surface expression of HCN4 pacemaker channels contributing to tachycardia ScienceDirect IGF 1 LR3 tells your muscle cells to grow, repair, and absorb nutrients better. It works directly at the muscle level to help you build lean muscle and recover faster.What it is IGF 1 40 YEARS OF IGF1: Insulin like growth factors: actions on the skeleton in: Journal of Molecular Endocrinology Volume 61 Issue 1 (2018) human IGF 1 LR3 protein 1000 g Human E. coli ReliaTech GmbH