L Carnitine is not a magic fat burner It won't melt fat, build muscle, or replace hard work. The only thing it burns is your money Stick to the basics How Acetyl L Carnitine Works HowStuffWorks Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get Essential L Carnitine Optimal Health Systems L Carnitine Linus Pauling Institute Oregon State University