is thiamine b1 Vitamin B1 VB1 Chinese Vitamin B1 Manufacturer Vitamin B1 (Vitamin B1, VB1), also known as thiamine, is the first water-soluble vitamin purified by people, and its chemical name is 3-[(4-amino-2-methyl-5-pyrimidinyl)-methyl chloride ]-5-2-hydroxyethyl)-4-methylthiazolium hydrochloride, which has the function of maintaining normal sugar metabolism.