L-Carnitine - Carnitine is a quat, quaternary ammonium cation, which is derived through biosynthesis of amino acids lysine and methionine. During the breakdown of stored fat in the lipids for purposes of generating additional metabolic energy, carnitine is needed to transport the fatty acids from the intracellular fluid to the mitochondria. The biologically active form of this stereoisomer is named l-carnitine. It is believed that l-carnitine has strong antioxidant effects and that it can strengthen the bone mass during the aging process. It is furthermore believed that l-carnitine promotes the glucose uptake and that it improves the male fertility in clinical trials. Concentrations of carnitine are found in highest levels in red meat and dairy products, but also in some seeds and pulses, as well as cereals and some fruits.