Crucial role of androgen receptor in resistance and endurance trainings induced muscle hypertrophy through IGF 1 IGF 1R PI3K Akt mTOR pathway Nutrition & Metabolism Springer Nature Link IGF 1 LR3 Essentia Peptides Research Peptides & Lab Grade Compounds Frontiers Sheep recombinant IGF 1 promotes organ specific growth in fetal sheep 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.