Dietary Supplement. Nutritionally Supports Efficient Heart Function* Now with Bioperine®. 100mg Extract per Capsule. 1.8mg Vitexins. Standardized Extract Hawthorn-Power is a high quality form of Hawthorn Extract. A great source of Vitexins, including Vitexin-2"-0-rhamnoside, Hawthorn-Power is standardized with a concentration of naturally-balanced active principles while retaining and enhancing whole plant synergistic benefits, thus making it one of the world s finest concentrated plant extracts. Our exclusive Freshcare™ System inhibits normal plant oxidation, maintaining product quality and extending freshness. It includes all-nat.