Vitamin B1 is a water-soluble vitamin, as are all vitamins of the B complex. Vitamins are classified according to the materials they dissolve in. Some dissolve in water, and others dissolve in fat. Water-soluble vitamins are carried through the bloodstream. Whatever the body does not use is eliminated in urine.There are high concentrations of Vitamin B1 in the outer layers and germ of cereals, as well as in yeast, beef, pork, nuts, whole grains, and pulses. Fruit and vegetables that contain it include cauliflower, liver, oranges, eggs, potatoes, asparagus, and kale. Other sources include brewer’s yeast and blackstrap molasses. Breakfast cereals and products made with white flour or white rice may be enriched with vitamin B.
