Sustain your healthy immune function with Hawthorne. Hawthorn berry or “Heart Herb'' is known for being a rich source of polyphenols - a powerful antioxidant compound found in plants. It is beneficial for people with heart failure, as it has been shown to improve heart function and decrease symptoms like shortness of breath and fatigue. Moreover, it can also reduce inflammation, which is thought to be the root cause of many chronic illnesses.