Vitamin C should be used with caution for people with urinary stones and hemolytic anemia, but is not absolutely contraindicated. Vitamin C is an essential vitamin that prevents scurvy and aids in the treatment of various acute and chronic infectious diseases. Vitamin C can promote the absorption of iron, but at the same time increase the risk of urinary stones, so patients with urinary stones need to be used with caution. For patients with hemolytic anemia, the acidic environment may aggravate the destruction of red blood cells, so patients with hemolytic anemia need to be cautious of vitamin C. However, these diseases are not absolute contraindications to vitamin C, such as combined with vitamin C deficiency, under the guidance of a doctor to take vitamin C in moderation. It is recommended to take vitamin C under the guidance of a physician, do not adjust the dose of the drug by yourself, and it is not recommended to take a large amount of vitamin C for a long time.