B12 is a vitamin that helps the formation of red blood cells, tissue and cellular repair, as well as DNA synthesis. If you have a B12 deficiency there is a possibility you may become anemic, meaning you will have less red blood cells and decreased ability to carry oxygen through your body. This deficiency can also cause weakness, dizziness, and shortness of breath. It is best to get treatment in
. the early stages to prevent further damages. You can find more information here: http://www.labtestsonline.org/understanding/conditions/vitaminb12.html
