There are no side effects, because it is a natural vitamin and has no synthetic ingredients. Vitamin C is acidic, and a large dose of vitamin C is harmful. After acidification of urine, the solubility of many excreta decreases, such as uric acid, and even crystals can be precipitated to form so-called crystallized urine, which will damage the kidneys due to mechanical extrusion and friction. Generally, the daily dose is not more than 1g, which is safe, but there are individual differences among different people. However, I still think that the landlord should pay more attention to drinking water while using large doses of vitamin C, and can take some baking soda appropriately when necessary. In addition, its ingredients also include vitamin P, which is an indispensable substance in the process of vitamin C digestion and absorption. It is generally believed that taking too high a dose will lead to diarrhea.