The daily intake of vitamin C, the recommended amount in the Chinese Dietary Guidelines is 100mg. If the intake of vitamin C is too little, it may cause scurvy to occur, causing swelling of the gums, bleeding and an increase in subcutaneous petechiae after a fall, prolonging the delayed healing time. If too much vitamin C is consumed, it may have some effect on calcium metabolism and the risk of urinary stones will be relatively high. Therefore, in nutrition, there is a tolerable, maximum and suitable intake, and the most suitable intake of vitamin C is about 100mg for normal people, which is neither too much nor too little.