D-Galactose 6-sulfate sodium salt is a sulfated monosaccharide derivative. It is the sodium salt form of galactose sulfated at the 6-position hydroxyl group. This modification significantly alters its physicochemical properties, such as solubility and charge, compared to native galactose. This compound serves as a key biochemical tool and a potential functional excipient. In research, it is primarily used as a substrate or inhibitor to study the activity and specificity of sulfatases, glycosidases, and carbohydrate-binding proteins (e.g., lectins). Its structure mimics natural sulfated glycans involved in various biological recognition processes. In pharmaceutical applications, sulfated sugars like this one are explored as novel functional excipients due to their potential mucoadhesive, stabilizing, or targeted delivery properties. The sodium salt form ensures good water solubility, facilitating its use in aqueous biochemical assays and formulation studies. Handling requires standard laboratory precautions for handling fine chemical powders.