Igf 1 LR 3 Enhanced Pharmaceuticals 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. Localized Igf 1 transgene expression sustains hypertrophy and regeneration in senescent skeletal muscle Nature Genetics IGF1 stimulates greater muscle hypertrophy in the absence of myostatin in male mice in: Journal of Endocrinology Volume 234 Issue 2 (2017) The mighty protein: insulin like growth factor type 1 The Physiological Society