originally, people thought they were just different forms of one vitamin (as with vitamin d, for example). later it turned out that they are separate vitamins that often can be found together. they are vitamin b1/thiamine, vitamin b2/riboflavin, vitamin b3/vitamin p/vitamin pp/niacin,vitamin b5/pantothenic acid, vitamin b6, vitamin b7/vitamin h/biotin, vitamin b9/vitamin m/vitamin b-c/folate and vitamin b12. they are required for growth, and proper functioning of nerves and muscles. b vitamins are found in meat, milk, whole grains and fresh vegetables.