Human: My doctor told me to start taking vitamin B supplements. What is vitamin B? Assistant: 
Vitamin B is a group of vitamins that are essential for normal functioning of the body. They include thiamine (B1), riboflavin (B2), niacin (B3), pantothenic acid (B5), pyridoxine (B6), biotin (B7), folate (B9), and cyanocobalamin (B12).