Testosterone is a widely known hormone that is naturally made by the human body exists in higher levels in men than in women, and is in great part responsible for many of the noticeable differences between the sexes, including larger muscle and bone mass. Testosterone boosters enhance the effects the hormone has within the body. Testosterone boosting supplements are often used by body builders to help increase muscle mass and energy, and by those who suffer from sexual issues to increase libido and stamina. Not only can you increase the testosterone levels within the body, but many products do this using completely natural substances, and there are even boosters that can help with not just the levels of the hormone, but also the uptake of the hormone, making the testosterone more effective. For both those interested in weight lifting and increasing their body mass, and those who need a sexual stimulant, testosterone boosters can be a smart choice.