This powerful heart-healthy herb was first used by Greek civilizations in their quest for good health. Today, it's recognized as one of the most effective organic herbal supplements in supporting optimal cardiovascular function. Some studies have shown that the active compounds in hawthorn (crataegus oxyacantha) encourage normal blood flow throughout the cardiovascular system; something every heart needs to function at its best. Hawthorn is also naturally enriched with procyanidins, flavonoids and flavonols to increase its antioxidant activity.