L Carnitine Linus Pauling Institute Oregon State University If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy. Mitochondrial control of fuel switching via carnitine biosynthesis Science How L Carnitine Helps with Fat Metabolism 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