Vitamins B1 and B2 can be taken together. Both vitamin B1 and vitamin B2 are trace element substances required by the human body, and the two taken together in moderation generally do not produce side effects. Vitamin B1, also known as thiamine or anti-neuritis, is the first water-soluble vitamin discovered, synthesized by fungi, microorganisms and plants, mainly used for foot disease and neuritis, etc. It can also maintain the normal metabolism of the human body. Vitamin B1 is widely found in cereals, legumes and dried fruits, animal offal, lean meat, poultry eggs and so on. It should be noted that vitamin B1 likes acid and fears alkali and does not tolerate high temperature, so it should not be combined with aspirin, alkaline drugs and tannin-containing Chinese medicines. Vitamin B2, also called riboflavin, is a kind of B vitamin, slightly soluble in water, is stable when heated in neutral or acidic solutions, and is easily digested and absorbed. It is mainly used for the treatment of xerostomia, labyrinthitis, scrotum, etc. It can also be used for the treatment of diseases such as total gastrointestinal extra-intestinal nutrition and malnutrition due to insufficient intake and progressive weight loss. It is widely found in animal liver, kidney, egg yolk, eel, and milk. It should be noted that vitamin B2 should not be taken at the same time with metoclopramide and sleeping pills, as well as on an empty stomach, and the urine after taking it is yellowish green.