Freeze Dried Sliced Turkey Gizzard treats with no additives or chemicals. The gizzard is a tremendous source of protein as this muscle meat is loaded with vitamins. Each treat is rich in Vitamin B-12, essential for brain function and forming red blood cells. The gizzards also have a lot of niacin for improving circulation and improving the nervous system. The Gizzard Delights also have antioxidants, produce energy and improve your dog’s coat thanks to loads of riboflavin.