Barkworthies Beef Cheeks are collagen based chews sourced from free-range, grass fed cattle. Collagen is a naturally occurring protein and is one of the key components of all connective tissue. It promotes mobility and flexibility, helps relieve joint pain and stiffness, supports healthy skin and coat, and boosts digestive health. These all-natural, long lasting, collagen chews are wrapped in real chicken for an extra delicious treat sure to keep your dog begging for more! Ingredients: Beef Collagen, Natural Peanut Butter Flavor, Vegetable Glycerin. Guaranteed Analysis: Protein 50%, Fat 1%, Fiber 3%, Moisture 12%, Calorie (kcal/kg) 3150, Collagen 85%