Too much vitamin C will usually have blood system, digestive system, nervous system and kidney system hazards. First, the blood system, vitamin C is a kind of ascorbic acid, such as long-term consumption of large amounts will lead to bleeding and not easy to clot or platelet dysfunction, dysfunction, etc.. Second, the digestive system, because it belongs to the acidic drugs, taking too much will lead to excessive secretion of stomach acid and stimulate the gastric mucosa, leading to nausea and regurgitation, abdominal distension, heartburn, etc.. Third, renal system hazards, resulting in increased kidney side effects, kidney overload, glomerular filtration rate, increased tubular reabsorption burden. Fourth, the hazards of the nervous system, such as neurasthenia, mental fatigue, etc.