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 IGF 1 LR3 (1mg) Alpha BioMed Pediatric Implications of Normal Insulin GH IGF Axis Physiology Endotext NCBI Bookshelf IGF 1 LR3 Dosage: What to Know About Dosing, Safety, and Clinical Use Mechanisms of putative IGF I receptor resistance in active acromegaly ScienceDirect IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society