Are L Carnitine and L Carnosine the Same? Anti Aging Systems 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 L Carnitine for Weight Loss: How It Works, Dosage & Best Supplement Zeelab Pharmacy 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.