Understanding the Benefits and Uses of Carnitine in Health and Fitness Fitness Health Read the caption Most people believe steroids, fat burners, or L Carnitine melt fat. The truth is different. Steroids mainly increase muscle protein synthesis and help maintain muscle mass, but they do If you're putting in the work but the scale isn't moving, your body might just need a little help tapping into its fat stores. That's where L Carnitine comes in. It's not a Difference between L Carnitine and L Carnitine L Tartrate