What is human growth hormone (HGH) primarily known for?

Human growth hormone (HGH) is primarily known for its role in promoting growth and development, particularly in the growth of cells. It plays a crucial part in stimulating the growth of various tissues, including muscle and bone, during childhood and adolescence. This hormone is vital for cell reproduction and regeneration, affecting overall body composition and health.

While HGH does have secondary effects on other aspects such as muscle development and metabolism, its primary function is centered around the growth and maintenance of healthy cellular structures throughout the body. This aspect is why the correct answer emphasizes its role in the growth of cells, setting it apart from other hormones that might focus more directly on energy levels, muscle hypertrophy, or weight management.