Gut derived IL 13 contributes to growth via promoting hepatic IGF 1 production Microbiome Springer Nature Link Personal experience with igf1 lr3 peptide? Injecting IGF1 LR3 directly into the muscle your training : r nattyorjuice 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