IGF 1, the Cross Road of the Nutritional, Inflammatory and Hormonal Pathways to Frailty 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 IGF 1 LR3 1mg Insulin Like Growth Factor Also, carbs play a big role in IGF 1. They raise insulin, which helps your body produce and use IGF 1 more effectively. When carbs are too low for too long, that whole system