Insulin plays a crucial role in muscle building as it facilitates the transport of glucose and amino acids into muscle cells. By promoting the uptake of nutrients, insulin serves as an anabolic hormone that enhances muscle protein synthesis. Additionally, insulin suppresses protein breakdown, allowing for growth and recovery following exercise. Post-workout, elevated insulin levels due to carbohydrate consumption can further enhance recovery and muscle growth. Therefore, managing insulin levels through diet and timing can optimize muscle-building effectiveness, making it essential for athletes and fitness enthusiasts.