B vitamins are water-soluble, as indicated by WebMD. This means that B vitamins dissolve in water, and since the human body does not store them, it needs replenish them regularly, making them a necessary part of any healthy diet.
There are a total of eight B vitamins, as explained by MedlinePlus. The B vitamins include thiamine (BB1), riboflavin (B2), niacin (B3), pantothenic acid (B5), pyridoxine (B6), Biotin (B7), B12 and folic acid. B vitamins can be obtained in the form of supplements, but they are also naturally found in plant and animal food sources. Many cereals and some packaged breads also contain B vitamins.