L Carnitine and Fat Metabolism: Supporting Lean Muscle Mass and Gut He Whey Isolate is the first Whey Protein Isolate containing 25g of protein per serving fortified with L Carnitine. L Carnitine, critical to the conversion of fat to energy, is commonly found in moderate levels The Ultimate Showdown: L Carnitine vs. Acetyl L Carnitine Ultimate Sup Whey protein with L carnitine. Good idea? : r Fitness_India