Most people do not suffer from vitamin C deficiency if they have a balanced diet and eat a variety of foods in their daily life, so long-term consumption is not recommended. If you need to take it for a long period of time, please take a supplement under the guidance of your physician. Vitamin C deficiency, also known as scurvy, is a rare disease caused by a long-term deficiency of vitamin C in the body. Vitamin C is found in most fresh vegetables and fruits and is not easily deficient in a balanced diet. Prolonged failure to eat fresh fruits and vegetables or a history of artificial feeding in infants requires vigilance for vitamin C deficiency. Long-term use of large amounts of vitamin C may cause diarrhea, skin rash, increased stomach acid, gastric reflux, sometimes visible urinary stones, increased oxalate excretion in the urine, deep vein thrombosis, hemolysis or coagulation within the blood. It is recommended to take vitamin C under the guidance of a doctor, not to adjust the dosage on their own to avoid the impact on the body.