Both taurine and L carnitine play roles in muscle function, and their combination could potentially enhance muscle health, recovery and weight management., Dr. Thacker breaks down the differences of Acetyl L Carnitine Superior Supplement Products Science First Designs for Health L Carnitine has become one of our top 5 sellers the last few years and when you review the research, you can see why. L carnitine is a supplement probably more well known if Ingredient Spotlight: L Carnitine Source: Biosynthesised in the body from the amino acids Lysine and Methionine, L Carnitine is a conditionally essential nutrient involved in energy metabolism and fat transport. Key Benefits