Localized Igf 1 transgene expression sustains hypertrophy and regeneration in senescent skeletal muscle Nature Genetics Discover IGF 1 (Insulin like Growth Factor 1), a key player in muscle development and overall growth! This essential peptide stimulates protein synthesis, helping to build lean muscle mass and enhance recovery after workouts. The mighty protein: insulin like growth factor type 1 The Physiological Society Muscle Building Peptides Revolution Health & Wellness IGF 1: Miracle Hormone or Health Hazard? Diet vs Disease