B complex supplements include a combination of B vitamins to aid in the maintenance of good health. B Vitamins include B1, B2, B3, B5, B6, B7, B9 and B12. B vitamins play an important role in cell metabolism helping our bodies convert the food that we eat into fuel. Each B vitamin has their own specific role and associated benefit. However, by combining B vitamins together into a supplement capsule or drop you can experience multiple benefits such as increase in energy, enhancement of mood, improvement of memory or stimulated immune system.