Compound carnitine is composed of L-carnitine and acetyl-L-carnitine. It is a natural substance in the human body. They have two main physiological functions: first, it is an important factor in the process of mitochondrial β-oxidation of fatty acids, and participates in energy metabolism; second The second is to increase the stability of cells by reducing reactive oxygen species (ROS) in the human body and inhibiting apoptosis.