Growth hormone primarily stimulates stature and bone growth, rather than directly increasing muscle mass disproportionately to height.

“The lack of growth hormone when you're young, so hypo classical hypopituitarism leads to shorter stature, dwarfism. Those individuals have an amount of muscle mass that's directly proportional to their stature. If you have hyperpituitarism, you're a giant. You're just tall. You don't have excessive muscle mass, you have it directly proportional to your stature.”