Ever heard of Acetyl L Carnitine? This amino acid is found in nearly all cells of the body. L Carnitine contributes to the production of energy from long chain fatty acids. And, it increases the activity Propionyl d5 L carnitine HCl LGC Standards Clean Nutrition Acetyl L Carnitine Sportsfuel Supplements NZ Your dog's heart works hard and L Carnitine helps fuel every beat. This natural protein like substance supports healthy heart function by helping carry fatty acids to where the body needs them most.