There are more contraindications to taking vitamin C than just the “six contraindications”, and the common contraindications can be summarized in two aspects, namely, bodily functions and drug contraindications. Body function: 1. Gastrointestinal ulcer disease: vitamin C is acidic and will stimulate the gastric mucosa when mixed with gastric juice, so patients with gastrointestinal ulcer should not take it; 2. Kidney disease: vitamin C will easily make gastric juice reflux and cause urinary stones; 3. Chemotherapy patients: cancer patients should not take large amounts of vitamin C during chemotherapy to avoid weakening the effectiveness of chemotherapy drugs and making tumor cells relapse or metastasize. The effectiveness of chemotherapy drugs, tumor cells relapse or metastasis; 4, vitiligo: vitamin C has an inhibitory effect on melanocytes, vitiligo patients long-term overdose of vitamin C may induce the onset of vitiligo; 5, pregnant women: vitamin C can affect the fetus through the placenta, and can seriously make the fetus suffer from sepsis. The first is that the body of the vitamin C can be used as a tool for the treatment of vitamin C. The second is that the vitamin C can be used as a tool for the treatment of vitamin C. The second is that the vitamin C can be used as a tool for the treatment of vitamin C. The second is that the vitamin C can be used as a tool for the treatment of vitamin C. The second is that the vitamin C can be used as a tool for the treatment of vitamin C. The second is that the vitamin C can be used as a tool for the treatment of vitamin C. The second is that the vitamin C can be used as a tool for the treatment of vitamin C. Vitamin C and sulfa drugs used together will reduce the activity of the drug or even completely ineffective. In addition, while taking vitamin C, you need to pay attention not to consume seafood, green beans, pig liver, cucumber, carrots, white radish, as well as eggs, milk and other foods, because vitamin C is easily oxidized, certain substances in food combined with vitamin C will destroy the original nutrition in food or make the role of vitamin C weakened. It is also important to avoid drinking alcohol and strong tea, and not to take the medicine on an empty stomach.