(S)-1,2-Butanediol is a specialty chemical widely used in the pharmaceutical industry as a chiral building block for the synthesis of various drugs, particularly those requiring specific stereochemistry for efficacy. It serves as a solvent in the production of active pharmaceutical ingredients (APIs) due to its ability to dissolve a wide range of compounds and can act as an absorption enhancer in transdermal formulations. In the cosmetics industry, it is utilized as a humectant and moisturizer in skincare and haircare products, helping to retain moisture and improve texture. Additionally, it is employed as an intermediate in the manufacture of polymers and resins, contributing to the production of high-performance materials. Its low toxicity and biodegradability make it a preferred choice in environmentally sensitive applications. Note: It is not typically used as a food additive.