The papery layer of Birch bark is considered to be highly astringent agent. By virtue of such quality its external use is recommended as styptic (to stop bleeding) and to stop any purulent discharge. Hence it is used more often to clean the wounds. Ayurveda also uses Birch in many formulations for obesity and other disorders of lipid metabolism. It has been described to be effective herb for treatment of obesity.
Bark contains an essential oil and betulin.