Healthvit Pine Bark Extract With Calcium | 60 Capsules It is One of the most potent antixoxidants ever discovered, pine bark from the Eastern Pine, contains complex plant compounds known as proanthocyanidins. Proanthocyanidins are condensed tannins that are responsible for astringent character of fruits, berries, beans, and tea. These bioflavonoids are powerful antioxidants, giving benefits to the cardiovascular system and capillary health. They are potent, free radical scavengers that help the body reduce oxidative damage.Pine bark extract is obtained from the inner bark of certain pine trees. It’s rich in compounds known as oligomeric proanthocyanidins (OPC), which belong to a class of polyphenols present in the fruit, seeds, leaves and bark of many plants. Also present in red wine and grape seed extract, proanthocyanidins are believed to have powerful antioxidant properties, meaning they work to counter the effects of oxidation (and free radical generation) in the body. Pine bark extract may also have anti-inflammatory effects and may exhibit some vasorelaxation activity promoting healthy blood pressure and circulation, therefore supporting cardiovascular health.