After the grape juice itself has been squeezed from the grape skin and 'meat' of the red or purple grape, a process of aqueous extraction, or extraction by water to put it more simply, is then performed upon the grape skin itself, giving us what is known as grape skin extract. It is more populary known as resveratrol. Grape skin extract contains the same components as grape juice itself but in different quantities. The appearance of grape skin extract is as a purplish red liquid. This liquid is often used as a food coloring in carbonated drinks, aides, beverage bases and alcoholic beverages.
Professor Jacques Masqueller, who is known as the father of OPC's or olygomatic proanthocyinidins, a professor at the University of Quebec, did intensive studies for over twenty years on OPC's which many medical doctors and other health care professionals, after careful study of his records and careful research of their own, consider to be natures most powerful antioxidants to fight free radicals. Free radicals are electronically unbalanced molecules in the human body which attack the cells in the body and damage them. Antioxidants work to inhibit these free radicals.
Of these OPC's one of the leading and the one which is considered by many medical doctors and other professional health care experts to be one of the very best is grape skin extract. Many clinical research teams have stated that they feel that grape skin extract is a substance which has proven useful in helping to minimize brain damage caused by strokes.
Many medical doctors and other professional health care workers have stated that research done on and with grape skin extract has shown that it seems to help the body to maintain healthy eyes and vision, especially when combined with European bilberry extract. Some feel that grape skin extract helps to keep eyes healthy and to help them to avoid such disorders as cataracts and macular degeneration, both disorders known to attack the eyes especially of those people who are in their senior years.
Because it has been shown as a substance which seems to help to maintain healthy blood vessels and veins, many medical doctors and other health care experts feel that grape skin extract helps to keep blood flowing freely and therefore is helpful in helping to avoid leg cramps, varicose veins, numbness or tingling of the arms and/or legs and some feel that this substance also helps the body to avoid impotency.
Some research made in the field of cosmetology has been said to show that grape skin extract also helps the human body to maintain skin elasticity and avoid some of the skin problems associated with growing older as well as such skin disorders.
 Ndiaye M, Philippe C, Mukhtar H, Ahmad N. The grape antioxidant resveratrol for skin disorders: promise, prospects, and challenges. Arch Biochem Biophys. 2011 Apr 15;508(2):164-70. Epub 2011 Jan 4.