Nails broken horizontally from the center may be caused by the lack of protein, calcium and zinc, iron and other trace elements, can be treated by supplementing calcium, protein and other preparations products and supplementing trace elements. The main component of nails is hard keratin, in the case of a lack of protein in the human body may cause nails from the middle of the lateral break phenomenon, you can take protein powder and other products to replenish protein to help nails to grow back, but also can be appropriate to supplement some calcium preparations, such as calcium gluconate tablets, to speed up the process of calcification of the nails. A deficiency of zinc, iron and other trace elements may also cause the nails to break horizontally in the middle, which can be treated with trace element supplements such as zinc gluconate. If the above phenomenon only occurs occasionally, in the absence of other uncomfortable symptoms, can not be targeted treatment, strengthen the observation can be, if frequent occurrences, it is recommended that the patient should consult a doctor in a timely manner.