IGF 1 LR3 Explained IGF 1 LR3 The Muscle Building Peptide Everyone's Talking About IGF 1 LR3 is one of the most powerful performance peptides used for muscle growth, recovery, and fat loss. It's a modified version Explanation, Benefits, and Dosing for IGF LR3 Wittmer Rejuvenation Clinic 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 Therapy Improves Muscle Size and Function in Experimental Peripheral Arterial Disease ScienceDirect