The Bcomplex vitamins are a family of nutrients that play multifaceted and essential roles in health and preventing disease. They are needed to make and repair DNA and increase energy levelsboth key steps for slowing the aging process. Some B vitamins are needed to make moodenhancing neurotransmitters such as serotonin and can have powerful antidepressant benefits. The B vitamin folic acid reduces blood levels of homocysteine a known risk factor for heart disease stroke cancer and Alzheimers