Vitamin B6
 

Vitamin B6 performs a wide variety of functions in your body and is essential for your good health. More than 100 enzymes need it to metabolize protein. Vitamin B6 is also necessary to turn Tryptophan into Niacin. It's going to help make red blood cell metabolism, the immune system and central nervous system all run more efficiently. A deficiency is directly linked to anemia, because B6 is necessary in the production of hemoglobin which carries oxygen in the blood. In short Vitamin B6 makes your blood work better, thus possibly increasing your life span.