L-carnitine, also known as L-carnitine and vitamin BT, has the chemical formula c7h15no3 and the chemical name (R) – 3-carboxyl-2-hydroxy-n, N, n-trimethylpropylammonium hydroxide internal salt. The representative drug is L-carnitine
     L-carnitine has many physiological functions, such as fat oxidative decomposition, weight loss, anti fatigue and so on. As a food additive, it is widely used in infant food, weight loss food, athlete food, nutritional supplement for the middle-aged and elderly, nutritional fortifier for vegetarians and animal feed additive.