Vitamin B12 is crucial for your energy levels. That’s because it works much like iron to help you build red blood cells, which are known for carrying oxygen and nutrients around the body. As soon as your vitamin B12 levels start to dip, you can find yourself with lower levels of energy as well. In fact, low B12 can even lead to its own kind of anemia. If you feel fatigued and tired, then low B12 may just be the culprit…