Vitamin B6 is soluble in water and is essential for good health. Our nervous system is dependent on this vitamin to function properly. It keeps the thymus, lymph nodes and the spleen that make white blood cells healthy, through cellular growth and protein metabolism. A deficiency in this vitamin can lead to a weakened ability to fight infections and will weaken the immune system. Vitamin B6 helps in the formation of Hemoglobin which increases the oxygen that is carried to the tissues. A deficiency can cause a type of anemia. Vitamin B6 helps to convert carbohydrates and other nutrients into glucose which maintains the sugar levels in our blood stream. Vitamin B6 is available in meat, fish, fortified cereals, poultry, some fruits and vegetables.