B is a complex of water-soluble vitamins. There are 11 different B vitamins.
If taken in a supplement, B vitamins should be taken as a balanced multi-vitamin, such as suggested in the table below. High-dose supplementation of a single B vitamin can cause imbalances of other B vitamins.
Since the functions of various groups of B vitamins are often closely related, deficiencies of the B complex are especially likely to result in malfunctions of the nervous system. Anemia is also likely to occur. A sore mouth with cracks at the corner, a burning sensation inside the mouth and a tongue which is swollen, shiny, purple, and cracked are all symptoms of vitamin B deficiency. ~ American physician Rudolph Ballentine