Nature`s Way Standardized Hawthorn Leaf is a scientifically and technically advanced herbal extract standardized to 1.8% to 2.2% vitexin. Helps promote cardiovascular health by improving blood and nutrient flow to the heart muscle. A healthy heart maintains circulation and nutrient delivery throughout the body and is essential for overall vitality and well being. Hawthorn berries are historically popular as a cardio tonic.