Vitamin C has an antioxidant effect and is an acidic component. Eating vitamin C in moderation is beneficial to the body, protecting the gastric mucosa, enhancing the stomach’s resistance to disease and repairing the gastric mucosa. But if you take a lot of vitamin C in excess and on an empty stomach, it can have the opposite effect, because it is acidic and can stimulate the gastric mucosa, especially for patients with severe gastritis with erosion or gastric ulcer, but it will have adverse effects. Therefore, it is recommended to take a moderate amount of vitamin C after meals, or fruits and vegetables containing more vitamin C. In fact, it still has a protective effect on the gastrointestinal tract, which can protect the mucosa of the gastrointestinal tract and increase the resistance of the gastrointestinal tract mucosa to disease.