These all-beef chews are available in a variety of sizes and shapes, including sticks, braids, a ring, and a spring. They are 100% natural and are free from grain, gluten, wheat, corn, and soy. They are naturally rich in chondroitin and glucosamine, which support healthy joints, healthy skin, and a beautiful, shiny coat. Redbarn's Collagen Chews are packed with 75% protein! Collagen is a protein found below the top layer of skin in both animals and humans. It is one of the key components of connective tissues. Think of it as the "˜glue' that helps hold the body together. Collagen has higher protein and less fat than traditional rawhide treats and digests much easier.