Explanation, Benefits, and Dosing for IGF LR3 Wittmer Rejuvenation Clinic What is IGF 1 LR3?, Insulin Like Growth Factor 1 Long R3 (IGF 1 LR3) is a modified version of IGF 1 with a longer half life, making it significantly more potent and effective for muscle growth, LONG R IGF I IGF 1 LR3, 100 mcg (1 complete cycle: 1000 mcg total) Beligas Pharmaceuticals IGF 1 LR3 Cycle: What to Expect The Peptide Report 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