Grapes

• Grapes are one of the primary sources of resveratrol. Different varieties of grapes have different resveratrol levels, although despite popular belief, both red and white grapes contain resveratrol. The compound occurs primarily in the skins of grapes, and secondarily in the seeds of grapes such as muscadine grapes.
  
  

Red Wine

• Red wine is the most well known source of resveratrol. Red wine can contain anywhere from two milligrams to 13 or more milligrams of resveratrol per liter. Red wine derives its resveratrol from the fermentation process, which includes the skins of grapes. This is in contrast to white wine, which has a negligible quantity of resveratrol due to the fact that it's fermented without the grape skins.
  
  

Japanese Knotweed

• Most of the resveratrol supplements on the market are produced from Japanese knotweed. Japanese knotweed contains high levels of resveratrol and also grows abundantly in a variety of climates.
  
  

Peanuts

• Peanuts contain a moderate level of the resveratrol compound, about half as much as red wine in an equal serving. One cup of boiled peanuts has as much as 1.5 milligrams of resveratrol.
  
  

Berries

• Many different berries have been cited as moderate sources of resveratrol. The list includes blueberries, strawberries, cranberries and bilberries, although all have less resveratrol than grapes.