Testosterone is a key hormonal driver required to build muscle, increase strength and to get lean. More specifically, Testosterone directly affects muscle growth by binding to receptors on the surface of muscle cells and amplifying the biochemical signals in muscle tissue that result in protein synthesis. Protein synthesis describes the process by which cells repair and regenerate themselves, resulting in new, larger fibres. This means more muscle mass and strength for you. In additional, Testosterone has a relation with Growth Hormone, and both hormones interact and increase as the other does. Growth Hormone is another crucial hormone when it comes to building muscle and improving strength. Testosterone boosters work to encourage your body to increase it's natural levels, to maximise your muscle building potential.