Is a multivitamin really as effective as a single dose of a vitamin?

B vitamins are usually administered as a multivitamin supplement, as they partly work synergistically. You can think of the B vitamins as a team. The individual B vitamins are dependent on each other to work effectively. Since our bodies do not store B vitamins, they need to be taken daily. If we take them as a complex, we ensure that we have access to all the B vitamins and our body absorbs what it needs.