B-complex is an often prescribed vitamin. What is complex about it and what is its usefulness ?

Explanation

It is a group of vitamins which contains vitamins `B_1, B_2,B_6,B_12` , biotin , pantothenic acid( vitamin `B_5`), folic acid and nicotinic acid (vitamin `B_3`). Since it is not a single vitamin but is a group of vitamins , that is why , it is called vitamin B-complex. it is required to release energy from food and to promote healthy skin and muscles. Its deficiency causes beriberi (vitamin `B_1`) and pernicious anaemia (Vitamin`B_12`).