Grape (Vitis vinifera) is indigenous to sourthern Europe and western Asia althought it is now cultivated in all temperate regions of the world. The leaves, fruit, seed, and juice are all used medicinally. Grape contains flavonoid, fruit acids, phenylacrylic acid derivatives, resveratrol and viniferins. Grape also contains tannins, specifically, procyanidolic oligmers, or proanthocyanidins.
Grape has been attributed with many health benefits. Grape improves poor circulation in the veins. It has also demonstrated strong antioxidant abilities. Proanthocyanidin, a compound found in grape seeds, strengthens the tiny blood vessels called capillaries, preventing leakage and reducing swelling in nearby tissues. It also helps prevent unstable oxygen molecules called free radicals from getting out of control and doing harm to the body. This antioxidant effect serves to reduce the buildup of the so-called "bad cholesterol" that clogs the arteries and leads to stroke and heart attacks. The extract's antioxidant properties may also discourage the growth of tumors.
There's at least some reason to believe that proanthocyanidin can also protect the liver from damage by the popular pain-killer acetaminophen, improve vision in older adults, boost heart function, reduce swelling after surgery; and even promote hair growth. However, none of these claims have been proven effective.
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Cautions There have been no reported side effects.