Vitamin B1 and vitamin B12 can be taken together. Both vitamin B1 and vitamin B12 are B vitamins, which are water-soluble vitamins. The main function of vitamin B1 is to participate in the process of biological oxidation and substance metabolism of the body, and it can nourish the nerves and promote the development of the nervous system. The main function of vitamin B12 is to participate in bone marrow hematopoiesis, prevent the emergence of megaloblastic anemia, nourish nerves and prevent damage to nerves in the brain, etc. Therefore, the mechanism of action of vitamin B1 and vitamin B12 is not exactly the same, but both have the function of promoting the development of the nervous system and nourishing the nerves, and the combination has a synergistic effect, so vitamin B1 and vitamin B12 can be taken together, and when taken together, the side effects are not superimposed, and the effect of treating neuritis and improving neurological symptoms will be better.