L-Carnitine helps convert fat to energy. It is best known for its cardiac support benefits. In the heart muscle, L-carnitine facilitates fatty acid use, and support rhythm, myocardial blood flow, and cardiac output. L-carnitine has also been shown to benefit athletic performance. This supplement helps maintain normal levels of total cholesterol, LDL cholesterol, lipoprotein(a) (associated with LDL cholesterol), and triglycerides already in the normal range.