Carnitine is not an amino acid in the strictest definition, but because it has a chemical structure like an amino acid it is usually put in that category. The main function of carnitine in the human body is to help transport long chain fatty acids which are burned inside cells to provide a major source of energy for your muscles. Thus carnitine is used in health supplements to boost energy, prevent fatigue, and maintain the body. Carnitine has the added benefit that it increases the effects of the anti-oxidants vitamin E and vitamin C.

Carnitine also increases the use of fat as an energy source, thus supporting a healthy heart, liver, and muscles. By doing so, carnitine helps to support normal blood lipids and sugar. Because men normally have more muscle mass than women they may need more carnitine. Vegetarians also are likely to need more carnitine supplementation since vegetable protein contains no carnitine.  Also, carnitine supplements have been suggested to enhance athletic performance and endurance and medical studies have also indicated that carnitine helps support a healthy heart.

Carnitine supplemental forms include: L-carnitine, DL-carnitine, and acetyl-L-carnitine.

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