Explanation, Benefits, and Dosing for IGF LR3 Wittmer Rejuvenation Clinic Organ weights in response to Long R3 insulin like growth factor 1 (LR3 Download Scientific Diagram IGF 1 LR3 and Penis Enlargement: What the Evidence Shows for Adult Men IGF 1 LR3 Injection Benefits And How It Works The HCG Institute 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.