Alpha-mangostin is the main xanthone purified from mangosteen and has health promoting benefits including anti-bacterial, anti-inflammatory, anti-oxidant, anti-cancer and cardioprotective activities. alpha-Mangostin (α-Mangostin) is a dietary xanthone with broad biological activities, such as antioxidant, anti-allergic, antiviral, antibacterial, anti-inflammatory and anticancer effects. It is an inhibitor of mutant IDH1 (IDH1-R132H) with a Ki of 2.85 μM. Alpha-mangostin is also an agonist of human STING.