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 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 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 IGF 1: Miracle Hormone or Health Hazard? Diet vs Disease