Hydroxocobalamin is an injectable form of Vitamin B12. Vitamin B12 helps your body use fat and carbohydrates for energy and allows it the ability to generate new proteins at a greater rate. It is also important for healthy functioning blood, cells, and nerves. Most people get enough vitamin B12 in their diet, but a deficiency may occur in certain health conditions (e.g., poor nutrition, stomach/intestinal problems, infection, cancer). Serious vitamin B12 deficiency may result in anemia, stomach problems, and nerve damage.