Corosolic acid, also known as 2α-hydroxyursolic acid, is a pentacyclic triterpenoid compound belonging to the ursane-type subclass. It is a natural bioactive phytochemical primarily isolated from the leaves of *Lagerstroemia speciosa* (Banaba plant) and other medicinal plants. Its molecular formula is C₃₀H₄₈O₄. The compound has garnered significant research interest for its potent biological activities, most notably its anti-diabetic properties. It functions as a natural insulin mimetic and glucose transporter 4 (GLUT4) activator, promoting glucose uptake in cells and helping to regulate blood sugar levels. Beyond its hypoglycemic effects, corosolic acid exhibits anti-inflammatory, antioxidant, anti-obesity, and potential anti-cancer activities, making it a subject of study in nutraceutical and pharmaceutical development. Due to its promising therapeutic profile, corosolic acid is widely used as a key active ingredient in dietary supplements aimed at supporting healthy glucose metabolism and weight management. It is also investigated as a potential lead compound for the development of novel anti-diabetic drugs. Standardized extracts containing corosolic acid are commercially available for research and product formulation.