It is false that six types of people should not take vitamin B₁₂ tablets. Generally only the following three patients should not take vitamin B₁₂ tablets: patients with vitamin B₁₂ allergy, gout patients, patients with neurological disorders. 1. Vitamin B₁₂ allergic patients: eating vitamin B₁₂ will appear rash, itching and other allergic symptoms of patients should not eat, so as not to cause acute urticaria. 2. Gout patients: gout patients in the body of polyribonucleotide decomposition speed, easy to form uric acid, and vitamin B₁₂ will also accelerate the decomposition of polyribonucleotide, so that the body’s uric acid content rises rapidly, resulting in an acute attack of gout. 3. Neurological disorders: neurological disorders are often complex, and it is not advisable to use vitamin B₁₂ without identifying the primary disease, or it may mask the clinical symptoms, leading to misdiagnosis or missed diagnosis. Oral vitamin B₁₂ tablets have been reported to have adverse reactions such as hypokalemia and hyperuricemia, and the contraindications are still unclear, they should be used under the guidance of a doctor, avoid self-medication.