Genuine Stacker 2 B12. B12 also supports the formation of red blood cells, which carry oxygen from the lungs to the rest of the body. Vitamin B12 is a water-soluble vitamin which performs a key role in regulating the brain and nervous system.
It is responsible for the smooth functioning of several critical body processes. It is possible for the body to develop a vitamin B12 deficiency. This deficiency is usually reported with symptoms of fatigue.