15-SAHSA, a branched fatty acid ester of hydroxy fatty acids (FAHFAs), is recognized for its involvement in metabolic regulation. This compound comprises stearic acid esterified to 5-hydroxy stearic acid and is notably influenced by dietary changes, such as fasting and high-fat consumption, with a link to insulin sensitivity. SAHSA levels are specifically found to be moderately increased in the serum of AG4OX mice, which are characterized by their glucose tolerance through the overexpression of the Glut4 glucose transporter in adipose tissue. Given the established functions of FAHFAs in enhancing glucose tolerance, prompting insulin secretion, and exerting anti-inflammatory properties, 5-SAHSA emerges as a potential bioactive lipid implicated in the management of metabolic syndrome and inflammation.