Testosterone is the powerhouse hormone when it comes to male characteristics. Not just responsible for the development of a man’s testicles and prostate, but also for producing masculine traits like an increase in muscle mass, better bone density and sex drive. Testosterone is even responsible for helping maintain sexual function and physical attraction – so thank Testosterone for that macho edge or ruggedly good looks. If you’re feeling a little lackluster in any of these areas, Testosterone might be something to consider!