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Vitamin B12B complex vitamins are also essential for breakdown of fats and protein. In addition, they also play an important role in maintaining muscle tone lining the digestive tract and promoting the health of the nervous system, skin, hair, eyes, mouth, and liver. From anti aging perspective, especially important is the fact that the synthesis of S-adenosylmethionine (SAMe), which is involved in immune function and mood, depends on the participation of vitamins B9 and B12. Together, these two vitamins also help regulate the formation of red blood cells and to help iron function better in the body. Also importantly, vitamins B12, B6, and B9 work together to control blood levels of the amino acid homocysteine, elevetad levels of which have been linked to increased risk of heart disease. The vitamin also enhances the immune system, as do other B complex vitamins, making it an anti stress vitamin. 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