B12 is injectable vitamin that gives you boost for anemia if you feeling tired got no energy feeling tingles in you feet and hands you might be low on b12 vitamin which effects the nervous system 

Vitamin B12 is a nutrient that helps keep your body's blood and nerve cells healthy and helps make DNA, the genetic material in all of your cells. Vitamin B12 also helps prevent megaloblastic anemia, a blood condition that makes people tired and …