In the food industry, vitamin C is primarily used as an antioxidant, preservative, and nutritional supplement. It effectively prevents oxidation of fats, pigments, and other easily oxidizable components in foods, extending their shelf life while maintaining their freshness, color, and flavor. Common applications include juices, jams, frozen fruits and vegetables, meat products, baked goods, and ready-to-eat food processing. Furthermore, vitamin C can be added to foods as a nutritional supplement to enhance their nutritional value and help people replenish their vitamin intake.

In health foods and nutritional supplements, vitamin C is widely used for its antioxidant and immunomodulatory properties. It is a key ingredient in various vitamin tablets, chewable tablets, oral liquids, powders, and complex nutritional supplements, primarily used to enhance immunity, relieve fatigue, improve skin health, and aid iron absorption. Long-term and appropriate vitamin C supplementation helps maintain good health, prevent deficiency diseases, and meet the nutritional needs of modern people in their fast-paced lives.