Resveratone   While all purple grapes contain  in their skins, purple or purple grapes, in addition to grapes from cooler regions, have a higher concentration of this compound compared to that that's present in thin-skinned white or green grapes, or grapes from warmer countries. Moreover, thick-skinned Malbec or muscadine grapes have the highest concentration of all.  is also discovered in the seeds, stems, and leaves of these grape vines. https://www.bignewsnetwork.com/news/271756465/warning-resveratone-2021-customer-exposed-resveratone-reviews