IGF 1 LR3 Injection Benefits And How It Works The HCG Institute IGF LR3 is a peptide that play a role in muscle growth, tissue repair and recovery. But like all peptide therapies, it's not one size fits all. We focus on using peptides thoughtfully and in the Peptides for Muscle Growth and Recovery: Benefits, Differences, and Ho Revolution Health & Wellness Which Peptides Are Best For Muscle Growth? IGF 1 LR3: 1 mg Supernova Peptides