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WHAT IT IS: Grapeseed extract is derived from grape seeds. Usually, red grapes make the best source. However, it’s a little more complicated than that. Like green tea, bark and some fruits, grapeseed extract contains particular antioxidant compounds called polyphenols. But some grapeseed extracts vary in the type of polyphenols they contain. There are a handful of different types, depending upon the length of the “chain” in the extract. They range from short monomers to long cyanidins, which is the scientific name for those headache-inducing tannins. The longer the chain, the less beneficial. The best grapeseed extract contains chains of 2-7, usually called oligomers.
The typical grapeseed extract supplement won’t mention any “mer” at all, and it’s hard to ensure that the product is actually beneficial.
STUDIES SHOW: Studies show  that grapeseed extract has excellent antioxidant abilities similar to green tea and vegetables. It’s one of the most potent antioxidant sources in the world, containing even more than the famously hyped pycnogenol. Grapeseed extract contains polyphenols, also called flavonoids or catechins. These compounds strengthen the arteries, improve free radical destruction and even help to prevent macular degeneration and cataracts. Studies have also shown the important cancer-fighting potential of grapeseed extract, as well as the tremendous potential benefit to the heart. And recent studies have established that the extract can help to reduce inflammation.
WHY WE LIKE IT: Grapeseed extract fights free radicals and oxidative stress. This means that grapeseed extract can also be of great potential benefit for fighting or preventing cancer, heart disease, and effects of aging. Studies done on grapeseed extract give scientists a clue as to why moderate wine intake may be beneficial for the heart. Known as the “French paradox,” scientists have been puzzled for years as to why the French, who consume large amounts of fat, have low rates of heart trouble. Scientists know explain it has something to do with the antioxidant, cardio-protective properties contained in grapeseeds. Grapeseed extract contains all the benefits of antioxidants without the toxic effect of too much alcohol.