Resveratrol Extract
So, you want to know how much resveratrol extract is in wine? You should first realize that the compound is naturally-occurring, meaning it isn't something that's added to wine. The amount of resveratrol extract in a bottle of wine depends on whether the grapes used to make the wine are organic and how the wine was made.
Grapes that were sprayed with pesticide contain little resveratrol. As you may have already read, resveratrol is a compound that grapes release if attacked by fungi. Pesticides inhibit fungi, and therefore limit the amount of resveratrol produced. Also, grapes that are grown in dry climates have less resveratrol than those grown in humid areas.
Unfortunately, most wines contain either no resveratrol at all, or very little. The surest way to obtain a good amount of resveratrol daily is to take pure extracts. Resveratrol extracts are becoming widely available. Some of the best resveratrol extract is thought to be made from organic French grapes known for their high resveratrol content. The resveratrol is carefully extracted to retain other compounds that naturally occur with it.