Arginine, Creatine, L Carnitine: Which to Choose? A Coach Debunks Workout Supplement Myths AROAK L Arginine and L carnitine , Arginine is an amino acid which we can also produce naturally . This increases your notice oxide production , human growth hormone and improves circulation. , These three L Arginine vs. L Carnitine Come see which nutrient best fits your needs L Carnitine 3000 16.5oz Liquid Musclesport