L-carnitine has good water solubility and water absorption, and can withstand high temperature above 200 ℃. It has no side effects on human body. Red meat is the main source of L-carnitine, and the human body can also synthesize it to meet physiological needs. It is not a real vitamin, but a substance similar to vitamin [4]. It has many physiological functions such as fat oxidative decomposition, weight loss and anti fatigue [42]. As a food additive, it is widely used in infant food, weight loss food, athlete food, nutritional supplements for the middle-aged and elderly, nutritional fortifiers for vegetarians [41] and animal feed additives.
L-carnitine can promote the activity of pyruvate dehydrogenase in cells, so as to promote the oxidation of glucose and delay the occurrence of fatigue during exercise. Excessive production of lactic acid during exercise will increase the acidity of blood tissue fluid, reduce the generation of ATP and lead to fatigue. Supplementing L-carnitine can remove excessive lactic acid, improve exercise ability and promote the recovery of exercise-induced fatigue.
In addition, it can also be used as a biological Antioxidant to remove free radicals and promote urea cycle. Ammonia is the product of protein degradation and one of the identification signs of exercise-induced fatigue. Even if the ammonia content is low, it will have great toxicity. L-carnitine can degrade ammonia into urea, so as to relieve the toxicity of ammonia.
L-carnitine protects the stability of cell membrane, improves human immunity, avoids the invasion of some diseases, and plays a preventive role in the prevention and treatment of sub-health. Energy is the greatest anti-aging force. Cells will be full of vitality when they have enough energy. In the process of human aging, the weakening of cell energy is one of the reasons for accelerating aging. Appropriate supplementation of L-carnitine can delay the aging process. 
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