It is used as a food or nutritional supplement and is the preferred form of the vitamin for food fortification. Thiamin mononitrate is used in the pharmaceutical industry to treat beriberi and general malnutrition or malabsorption.Thiamine can be found naturally in foods like grains, yeast, molasses, pork and animal organ meats.Dairy, eggs and legumes have smaller amounts. Though thiamine is found naturally in foods, thiamine mononitrate is not.Thiamine mononitrate is synthesized by removing a chloride ion from thiamin hydrochloride and mixing the final product with nitric acid.hiamine mononitrate is also specifically known as mononitrate de thiamine, nitrate de thiamine, and thiamine nitrate.