Id say yes, based on its primary use, it wont hurt if it didnt either.
I last a bit longer in the gym, and I like mental thought it will be pulling energy from fat.
Its in alot of fat burners already, along with green tea extract, and caffeine
Carnitine boosts energy by stimulating the body's burning of tryglycerides as fuel, and sparing the supply of glycogen stored in the liver for heavier exertion. During exercise, the body will burn fat at a rate of 75-80% of maximum exertion, thus less glycogen from carbohydrates is burned. L-carnitine allows the body to burn more fat, save more glycogen, and ultimately boost stamina and endurance. By providing more fat to the muscles, carnitine makes accessible an otherwise unavailable energy source.