Introducing the Collagen Bully Sticks. These treats offer a concentrated protein source, delivering vital nutrients, vitamins, and minerals. They boast abundant chondroitin and glucosamine content. Collagen, located beneath the outer layer of skin (two layers below the sturdy surface utilized for leather, upholstery, and rawhide), plays a crucial role in connective tissue. Acting as a bonding agent, collagen aids in maintaining structural integrity.