Thiamine, also known as thiamin or vitamin B1, is a vitamin found in foods including yeast, cereal grains, beans, nuts, and meat. It is often used in combination with other B vitamins, and found in many vitamin B complex products. Vitamin B1 is manufactured as a dietary supplement and medication. Thiamine is important in the breakdown of carbohydrates from foods into products needed by the body. Thiamine is used to treat or prevent vitamin B1 deficiency (see: Wikipedia).