Testosterone is the key male sex hormone, but is also important for women.  It plays a crucial role in muscle growth, fat loss, and optimal health.  However, testosterone levels in men are now lower than ever, partly caused by the unhealthy modern-day lifestyle

Testosterone boosters are natural supplements that can increase your testosterone levels.  They work by directly increasing testosterone or related hormones, but some work by preventing testosterone from being converted into estrogen.  Many of these boosters have been scientifically verified in human studies.