Digallic acid is widely used in the pharmaceutical industry due to its antioxidant, anti-inflammatory, and potential anti-cancer properties. It is incorporated into formulations aimed at reducing oxidative stress and inflammation in various medical conditions.

In the food industry, it serves as a natural preservative, helping to extend the shelf life of products by preventing oxidation and microbial growth. Its ability to stabilize food items makes it valuable in maintaining product quality over time.

Additionally, digallic acid is utilized in the cosmetic sector for its skin-protective benefits. It is included in skincare products to combat signs of aging, protect against UV damage, and improve overall skin health by neutralizing free radicals.

In research, it is employed as a standard or reference compound in studies focusing on polyphenols and their effects on health. Its role in these studies helps to advance understanding of polyphenol benefits and mechanisms of action.