Hawthorn may be helpful in some patients with heart failure. 
Derived from the flower, leaves, and fruits of the plant, hawthorn is also known in Asia as Shan Zha. It is used in traditional Chinese medicine to improve digestion and treat heart problems. Hawthorn also has a long history in European medicine as a heart tonic.
Studies in the lab suggest a range of anti-inflammation, heart-protective, and digestion-improving properties. Studies in humans show benefits in patients with congestive heart failure, although a few trials did not.
More studies are needed to confirm safety and effectiveness of hawthorn. In addition, it should not be used in place of conventional heart failure therapies and its use should be monitored by the treating physician.