As niacinamide belongs to vitamin drugs, patients usually do not grow hair after using niacinamide. 1. Niacinamide belongs to vitamin drugs, common dosage forms are tablets, injections, etc. Niacinamide tablets can be used to prevent and control pellagra and other niacin deficiency diseases, and niacinamide injections can be used to prevent and control pellagra of niacin deficiency, coronary heart disease, viral myocarditis, rheumatic cardiomyopathies, and a small number of digitalis intoxication and other concomitant arrhythmias. 2. Niacinamide is often used in the production of cosmetics, with the role of preventing the body’s melanin to keratinocyte transit, repairing the skin’s stratum corneum, strengthening the skin’s own defenses, etc. In general, niacinamide does not stimulate hair growth, patients will not cause hair growth after using niacinamide. 3. It should be noted that niacinamide and the metabolic process in the body, for lipid metabolism, tissue respiration of oxidation and glycogen decomposition necessary. However, it does not have vasodilatory effect and can be used by hypertensive patients when needed. 4. It is recommended that patients who are allergic to nicotinamide should be prohibited from using this drug, overdose in pregnancy may be teratogenic, lactating women should not lactate when using this product. All of the above medications should be used under the guidance of a doctor, avoid self-medication.