B vitamins are often thought of as energy vitamins. People tend to look for them in drinks and nutrient bars for a mental or physical energy boost. Few realize the crucial roles that B vitamins play in the body. Research has shown that B vitamins are necessary for:1 DNA/RNA synthesis and repair, Proper immune function, Neurotransmitter synthesis, and Healthy DNA methylation. Adults with a low B-vitamin status are at increased risk for developing age-related disorders, particularly cognitive and cardiovascular disease.1 Vitamin B1 and the Brain The first B vi..