Vitamin B family includes vitamin B1, vitamin B2, vitamin B3, vitamin B6, vitamin B12, etc. Each vitamin has its own indications and contraindications. Before choosing to supplement vitamin B family, it is necessary to clarify whether there is a deficiency and the degree of deficiency, and it is also necessary to understand the factors affecting the digestion and absorption of vitamin B family as well as one’s own metabolic status. Therefore, if patients need to take B vitamins, they should consult a doctor and avoid self-application. There are six taboos when taking vitamin B: 1, kidney dysfunction patients: vitamin B is generally metabolized through the kidneys, excessive supplementation will increase the burden on the kidneys, so patients with kidney dysfunction is recommended to prevent overdose; 2, patients with gastrointestinal diseases to avoid taking before meals: when ingesting vitamin B, it will stimulate the gastrointestinal tract and may aggravate gastrointestinal diseases, so patients with Patients with digestive tract diseases are recommended to take after meals or with meals; 3, diabetic patients with caution: taking vitamin B may have an impact on the metabolic function of the body, so patients with diabetes should be used under the guidance of a doctor; 4, avoid using with stimulating foods: such as coffee, strong tea, alcoholic beverages, etc., if taken with vitamin B, may have an impact on the absorption of vitamins, weakening the effect 5, avoid taking a long time or a large amount: long time or a large amount of vitamin B, may produce dependence or vitamin supplement overload, so it is recommended that patients take in moderation; 6, avoid and high dietary fiber food together: when taking vitamin B should pay attention to avoid the intake of high dietary fiber food at the same time, so as not to affect the absorption of vitamins. In addition, if the patient is taking metoclopramide, guanethidine sulfate tablets, birth control pills, etc., it may affect the absorption and metabolism of vitamin B, so try to avoid the above drugs and vitamin B taken together.