IGF1 LR3 Peptide Anderson Longevity Clinic 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 Peptide Therapy Muscle Growth & Recovery Esthetic Solutions Overexpression of Igf2 derived Mir483 inhibits Igf1 expression and leads to developmental growth restriction and metabolic dysfunction in mice ScienceDirect