There are no vitamins for mouth ulcers that you can take to get better faster, and some of the vitamins commonly used for mouth ulcers are vitamin C and the B vitamins. 1. Vitamin C: the drug is mainly used for the treatment of scurvy, but also for a variety of acute and chronic infectious diseases as well as purpura and other adjuvant therapy, vitamin C is involved in the formation of antibodies as well as collagen in the organism, tissue repair, maintenance of immune function, maintain the integrity of blood vessels, and promote the absorption of non-heme iron, some people in the use of the drug, there may be a headache, frequent urination, nausea, stomach cramps and other adverse reactions, to the drug Allergic people are prohibited to use. 2. Vitamin B: This drug is used for the prevention and treatment of malnutrition caused by B vitamins deficiency, beriberi, anorexia, pellagra, etc. It is involved in the metabolism of carbohydrates, fats, and proteins, and some patients may have adverse reactions such as irritability, itching, abdominal pain, nausea, and skin rashes, etc. It is forbidden to use in those who are allergic to the drug, and should be used with caution in patients with hepatic or renal insufficiency. It is recommended that under the guidance of a doctor, strictly comply with medical advice to use drugs, not blindly use drugs or unauthorized changes in drug dosage, so as not to cause adverse effects on the body.