IGF 1 LR3: Dosage Results and Safety Guide Vita Bella Health Superior Peptide IGF 1 LR3 Muscle Growth & Recovery The mighty protein: insulin like growth factor type 1 The Physiological Society If your goal is better body composition, that means more muscle and less fat, certain peptides can help. These are not steroids and they do not replace testosterone if testosterone is low. 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