[Group B vitamins as new variables related to the cardiovascular risk] (Ital Heart J Suppl. 2005) ""The nutritional status and plasma concentrations of some group B vitamins, namely vitamin B6, vitamin B12 and folic acid, have recently emerged as inverse correlates of cardiovascular risk Ä the simplest hypothesis to explain the relationship of vitamin B6, vitamin B12 and folic acid on the one hand, and cardiovascular risk on the other is that this relationship is mediated by plasma levels of homocysteine."