Lithium tartrate is primarily used in the pharmaceutical industry as a source of lithium, which is essential in the treatment of bipolar disorder and other mental health conditions. It helps stabilize mood swings and manage symptoms of mania and depression. Additionally, it finds application in research laboratories as a reagent in various biochemical and chemical processes. In some cases, it is also utilized in the production of specialty glasses and ceramics, where it acts as a flux to lower melting points and improve material properties. Its role in these industries highlights its versatility and importance in both medical and industrial contexts.