L-(-)-Tartaric acid is widely used in the food and beverage industry as an acidulant and flavor enhancer. It is a key ingredient in baking powder, where it reacts with sodium bicarbonate to produce carbon dioxide, helping dough rise. In winemaking, it stabilizes the acidity and flavor of wines, preventing spoilage and enhancing taste. It is also used in candies, jellies, and soft drinks to provide a tangy flavor.

In pharmaceuticals, it serves as a chiral resolving agent to separate racemic mixtures into their enantiomers, which is crucial for producing specific active pharmaceutical ingredients. Additionally, it is used in effervescent tablets and as a chelating agent in certain medications.

In the cosmetic industry, it is incorporated into skincare products for its antioxidant properties and ability to exfoliate and brighten the skin. Its versatility and effectiveness make it a valuable compound across multiple industries.