Resveratrol
Resveratrol is a polyphenol that can be found in over 72 plant species. Also a naturally occurring component of red wine, it is predominantly concentrated in the skins of red grapes, serving as a natural defence and protective substance for the plant against parasites, fungal attack and adverse weather conditions such as moisture, UV radiation and temperature fluctuations.
Resveratrol exists in two different variants, known as isomers: cis-resveratrol and trans-resveratrol. Only the trans form develops its full biological and physical properties. Cis-resveratrol occurs far less frequently in nature than the bioactive trans-resveratrol.