Eat more bone marrow. Bone marrow is considered a delicacy in many parts of the world. Its benefits include building immunity, repairing wounds, helping with digestion, and even fighting cancer. Bone marrow is full of collagen. Collagen is the most abundant protein in the body. Its fiber-like structure is used to make connective tissue. Our bodies gradually make less collagen as we age, decreasing skin elasticity leading to aged skin. So it is important to secure food sources of collagen. Bone marrow is a perfect source of Collagen. It's also rich in glucosamine, which defends against osteoarthritis, relieves joint pain, and reduces inflammation in the joints.