Can peptides like sermorelin, IGF 1 LR3, and GHS boost muscle growth? Maybe. Are they safe? We don't know. These compounds boost natural growth hormone (GH) and IGF 1 levels, key drivers of muscle Late life targeting of the IGF 1 receptor improves healthspan and lifespan in female mice Nature Communications Human Insulin like Growth Factors 1 Long R3 (IGF 1 LR3) ELISA Kit MBS733937 from MyBioSource.com Biocompare.com IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society 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 IGF1 LR3 Peptide Review: Benefits, Before & After, Dose, & More