Absorption is high, all over the small intestine. Before absorption, it is released from the bound state by digestive enzymes. After 15 minutes it is found in the blood, after 30 minutes - in other tissues. In the blood, the concentration is relatively low, while the plasma circulates predominantly free
thiamine, in erythrocytes and leukocytes - its phosphoric esters. Phosphorylation occurs in the liver. The most active phosphoric ester is thiamine diphosphate, which has coenzyme activity. It is found mainly in striated muscles, liver, heart, brain, kidneys, spleen, half of them in striated muscle and myocardium, and about 40% in internal organs. It is excreted through the intestines and kidneys.