(S)-Thiazolidine-4-carboxylic acid is primarily used in the pharmaceutical industry as a precursor in the synthesis of various drugs, particularly those targeting metabolic and inflammatory conditions. It serves as a key intermediate in the production of thiazolidinediones, a class of compounds used to treat type 2 diabetes by improving insulin sensitivity. Additionally, it is utilized in the development of antioxidants and anti-inflammatory agents due to its ability to modulate oxidative stress and cellular damage. In cosmetic formulations, it is employed for its skin-conditioning properties, helping to improve skin texture and hydration. Its chelating properties also make it useful in certain industrial applications, such as metal ion stabilization in chemical processes.