L-carnitine tartrate is mainly concentrated in muscle. The significance is that the main function of the compound is to provide an additional source of ATP for this form of highly metabolized tissue. Due to its role in mobilizing fat into muscle tissue, the presence of L-carnitine actually helps chemicalbook improve muscle endurance because it increases energy supply. At the same time, it also helps to improve endurance by maintaining the storage of muscle glycogen and preventing the accumulation of lactic acid. L-carnitine tartaric acid is considered to be a good weight loss supplement due to its ability to increase fat mobilization.