Discovered at the beginning of the 20th century and thoroughly researched for the first time in the 1970s, L-Carnitine is a fitness supplement for all types of athletes which increases the muscle efficiency of the untrained by more than 30%. Figure-conscious people can use it to achieve and maintain their ideal weight. It also increases mental capacity, since it has a positive influence on stress and fatigue. As a result, the body?s natural immune shield is strengthened.