Beef Bone marrow is a type of tissue found in bones. The bone marrow of animals is often served alongside toast, used as a base for soup, or spread over a variety of foods. Beef Bone marrow is high in calories and fat. It also contains protein, vitamin B12, riboflavin, collagen, and conjugated linoleic acid. Though research is limited on the health effects of bone marrow itself, studies show that many of its components could support joint function, decrease inflammation, and promote skin health.