What Are Resveratrol Contents?

Resveratrol is a phytolexin produced naturally by several plants when under attack by pathogens such as bacteria or fungi. Resveratrol has also been produced by chemical synthesis and is sold as a nutritional supplement derived primarily from Japanese knotweed.

Resveratrol ultra is found in the skin of red grapes and is a constituent of red wine, but apparently not in sufficient amounts to explain the French paradox. Experiments have shown that resveratrol treatment extended the life of fruit flies, nematode worms and short living fish, but it did not increase the life span of mice.

Resveratrol (3,5,4'-trihydroxystilbene) is a polyphenolic phytoalexin. It is a stilbenoid, a derivate of stilbene, and is produced in plants with the help of the enzyme stilbene synthase.

It exists as two geometric isomers: cis- (Z) and trans- (E), with the trans-isomer shown in the top image. The trans- form can undergo isomerization to the cis- form when exposed to ultraviolet irradiation.

Trans-resveratrol in the powder form was found to be stable under "accelerated stability" conditions of 75% humidity and 40 degrees C in the presence of air. Resveratrol ultra content also stayed stable in the skins of grapes and pomace taken after fermentation and stored for a long period.

Over twenty years earlier a scientific study which came to be known as the "French paradox" description why the French, who eat unhealthy amounts of oily foods have the decreased rate of heart disease and related illness in the western world. The solution was found in the red wine they were drinking, to be very pr

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