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Vitamin B6 is a water-soluble vitamin that performs a wide variety of functions in the body. For example, vitamin B6 is needed for more than 100 enzymes involved in protein metabolism. It is essential for red blood cell metabolism and the nervous and immune systems need vitamin B6 to function efficiently. B6 is also required for the production of hemoglobin a protein-based component of red blood cells which is primarily responsible for transferring oxygen from the lungs to the rest of the body. Through its involvement in protein metabolism and cellular growth, B6 is important to the immune system. It also helps maintain blood glucose (sugar) within a normal range. When caloric intake is low your body needs vitamin B6 to help convert stored carbohydrate or other nutrients to glucose to... Less