RED WINE RESVEATROL Natural Biology's Vintage Resveratol 100% is exclusively sourced from French Red Wine Grapes found in the Rhone Valley of France.   Resveratrol from French Red Wine Grapes, such as those sourced from the Rhone Valley, is often marketed as having higher absorption and bioavailability compared to resveratrol derived from Polygonum cuspidatum. The improved performance of grape-sourced resveratrol is...