One of the B vitamins, a group of water-soluble vitamins that participate in many of the chemical reactions in the body.
Thiamine is important in the production of energy.
Dairy products and milk, fruits, and vegetables are not very high in thiamine, but when consumed in a large amounts they become a significant source. It is also essential for the functioning of the heart, muscles and nervous system. The best way to get the daily requirement of essential vitamins is to eat a balanced diet that contains a variety of foods from the food guide pyramid. A total absence of thiamine can cause the disease called beriberi, which is very rare in the United States. There is no known toxicity to thiamine.