DL-Malic acid disodium salt is widely used in the food and beverage industry as an acidity regulator and flavor enhancer. It helps to balance and stabilize the pH levels in various products, improving their taste and shelf life. This compound is commonly found in soft drinks, fruit juices, and candies, where it imparts a slightly tart flavor, enhancing the overall sensory experience.

In the pharmaceutical sector, it serves as an excipient in drug formulations, aiding in the stabilization and delivery of active ingredients. Its buffering properties make it useful in maintaining the desired pH in medicinal products, ensuring their efficacy and safety.

Additionally, it is utilized in cosmetics and personal care products as a pH adjuster and chelating agent. It helps to maintain the stability of formulations and enhances the performance of other ingredients in products like creams, lotions, and cleansers.

In industrial applications, it acts as a chelating agent in water treatment processes, helping to control metal ions and prevent scale formation. This contributes to the efficiency and longevity of water treatment systems.