Vitamin B1 is also known as thiamine, thiamin and aneurin. Thiamine is the currently accepted name for vitamin B1 in the US. Aneurin is still widely used in Europe, especially in the United Kingdom. Necessary for proper metabolism of sugar and starch to provide energy. Maintains a healthy nervous system as well as aiding proper function of the heart and other muscles. Stress increases the need for B-1 and all B vitamins.