Sodium D-lactate is the sodium salt of D-lactic acid (the R-enantiomer), a chiral specialty chemical and biochemical reagent used primarily in laboratory research and organic synthesis. High-purity grades (e.g., 99%) are employed in studies of lactate metabolism, D-lactate dehydrogenase activity, enantioselective catalysis, and as a chiral building block for pharmaceuticals and fine chemicals.

In the food industry, it is used as a preservative and flavor enhancer to inhibit microbial growth and extend shelf life, particularly in baked goods, dairy products, and beverages for improved texture and stability.

In pharmaceuticals, it functions as an excipient for drug stabilization and delivery. It is also researched for medical applications, though standard intravenous fluids typically use the L-isomer for better metabolic compatibility.

In cosmetics and personal care, it acts as a humectant in lotions, creams, and serums to retain skin moisture and enhance elasticity.

Industrial uses include biodegradable cleaning agents and as a component in the production of biodegradable plastics, supporting eco-friendly solutions.