In fact, nothing is good, let alone Vc. For most adults, the optimal intake of VC is in the range of 2.3g ~ 10g. In 2000, the Food and Nutrition Committee of the American Institute of Medicine assessed that it was safe for adults to consume no more than 2,000 mg of VC per day, while the newly revised Dietary Nutrition Guide in China pointed out that the recommended daily intake of VC was 100mg. Studies have shown that excessive intake of Vc can lead to kidney disease. Taking 1 ~ 4g daily can cause diarrhea, rash, gastric acid increase, gastric juice reflux, urinary calculi and increased excretion of oxalate and urate in urine. In fact, as long as the diet is balanced, the daily diet can meet the needs of the human body for VC, and no additional supplements are needed.