L-Carnitine is an important element in the transport of long chains of fatty acids to the mitochondria so that they are burned as an energy source. L-Carnitine also increases the oxidation of pyruvates and BCAA in the energy cycle so more energy available for muscle work. It also inhibits build-up of lactic acid muscle. It is interesting to know that the oral intake of L-Carnitine influences the blood level of Carnitine. In a double-blind test, an intake of 2g per day in people with a normal rate at baseline gave them an increase in the treadmill distance of 75%.
Finally, L-Carnitine decreased blood levels of lactate and pyruvate post exercise and significantly increases the ability to train.
Denys jr Lajeunesse