FAS-IN-1 is primarily used in research settings to study its potential as an inhibitor of fatty acid synthase (FAS), an enzyme involved in the synthesis of fatty acids. By targeting FAS, it is investigated for its role in disrupting lipid metabolism, which is crucial in various diseases, including cancer. Researchers explore its ability to inhibit tumor growth by cutting off the supply of fatty acids necessary for cancer cell proliferation. Additionally, it is studied for its potential in treating metabolic disorders such as obesity, as FAS plays a key role in fat storage. Its application extends to understanding the biochemical pathways of lipid synthesis and evaluating its therapeutic potential in preclinical models.