Crataegus Oxycantha TSA Characteristics: Cardiovascular regulator, coronary dilator, and cardiac trophism modifier. Hawthorn contains essential oil, crataegic acid, and other active ingredients, from which three groups of substances have been isolated: 1) - pentacid triterpene compounds; 2) - flavonoid-structured glucoside compounds; 3) - catechins, phenolic acids, and aminopurines. All these substances contribute to the plants hypotensive effect (coronary action)