Ascorbic acid has a wide range of uses in various industries, including food and beverage, pharmaceutical, and cosmetic. Here are some of the major uses of ascorbic acid:

1. Food and Beverage: Ascorbic acid is commonly used as a food preservative to prevent spoilage and discoloration of fruits, vegetables, and other foods. It is also added to many processed foods and beverages as a flavor enhancer and to provide additional nutritional value.
2. Nutritional Supplements: Ascorbic acid is a common ingredient in dietary supplements and multivitamins, as it is an essential nutrient that the body cannot produce on its own. Supplements containing ascorbic acid are often used to prevent or treat vitamin C deficiency.
3. Pharmaceutical: Ascorbic acid is used in various pharmaceutical applications, including the production of antibiotics, antihistamines, and pain relievers. It is also used as a reducing agent in the formulation of some drugs.
4. Cosmetic: Ascorbic acid is used in many cosmetic products, including skin creams, lotions, and serums, as it is believed to have antioxidant properties that can help protect the skin from damage caused by free radicals. It is also used as a skin brightener and to promote collagen synthesis.
5. Water Treatment: Ascorbic acid is sometimes used in water treatment as a reducing agent to neutralize chlorine and other disinfectants.

Overall, ascorbic acid is a versatile compound with many applications across various industries.