Vitamin B-12 is a water-soluble B complex vitamin that can be found in a number of foods such as meat, fish, and dairy products. Vitamin B-12 injections may improve energy, metabolism, mood, and cognition, as well as aid prevent or treat pernicious anemia and B-12 insufficiency. If you are a vegetarian and are experiencing fatigue, constipation, memory loss, and decreased energy, you may be deficient in B-12. Consider taking supplements.
