vitamin B-12 

be aggressive

clinical background 

A Deeper Look:  In the bodies nervous system, there is an insulating layer around the conductive system called the myelin sheath. B-12  functions in the metabolism of fatty acids involved in the formation of this layer of protection around nerve cells. This same layer insulates nerve cells and increases the speed of electrical impulses between nerve cells. 
A Deeper Look: Red blood cells (or RBC's) are responsible for carrying oxygen to the organs of he body. When they aren't formed properly, it directly affects the bodies ability to function at a normal level. Signs & symptoms of B-12 deficient anemia include fatigue, weakness, weight loss, numbness &  tingling in hands or feet.