There are no four people who must take vitamin C. Vitamin C, also known as ascorbic acid, is one of the essential nutrients for the human body and plays an important role in the body’s material and energy metabolism. It should be noted that the human body can not synthesize vitamin C, it must be supplied from the outside through food and other means. When the body’s intake of vitamin C is reduced or the need to increase and can not be supplemented in time, the body will appear vitamin C deficiency. Only the body of vitamin C deficiency in the population must be supplemented, and not for a specific four kinds of people. The main sources of vitamin C are fresh vegetables and fruits. Some of the vegetables and fruits that are rich in vitamin C are peppers, tomatoes, cherries and pomegranates. It is recommended that when a patient develops symptoms related to vitamin C deficiency, he or she should seek medical attention and take vitamin C supplements under the guidance of a medical professional.