It follows that if Red Wine grape extracts and Red Wine are good for you, so too is grape juice. While this is naturally true, there are some caveats.

Indeed, 90% of the nutrient benefit of the grape is in the skin and seeds, and these two parts indeed stay mixed with the grape pulp when producing grape juice. These two parts also contain the powerful Resveratrol, flavanoids and other polyphenols.

However, commercially available grape juice is generally pasteurized at high heat, and this can reduce and even inactivate polyphenols such as Resveratrol. In addition, these grape juices add sugars and preservatives. Furthermore, analysis of these products show that Resveratrol is bound to a sugar molecules, which reduces the biological action compared to the un-bound trans-Resveratrol found in Red Wine, grape skins, and nutraceutical supplements such as Vindure 900.

Still, grape juice is indeed good for you — but you should consider the organic, less sweetened varieties.