Your pet's heart works nonstop. So Fera Pets gives it the fuel it needs with their Cardiac Support supplement A key ingredient is L Carnitine, a naturally occurring amino acid that helps Rooted Owl Cardio Support Capsules with L Taurine & L Carnitine, 1.8 oz., 60 Ct. Petco LiquiCarn for Dogs and Cats L Carnitine Supplement VetRxDirect Hill's Science Diet Adult Light Small Bites Dry Dog Food, Chicken Meal & Barley, 30 Pound Bag Pet Supplies Plus