Specific nutritional or therapeutic agent including a mixture of grape and blueberry

A nutritional or therapeutic agent consisting essentially of a mix obtained from Vitis vinifera and Vaccinium angustifolium extracts, wherein the mix contains:

• at least 1% of catechins and/or epicatechins, the percentage being given by weight in relation to the total weight of the mix,
• at least 5 ppm (parts per million in the mix) of ferulic acid;
• and
• at least 200 ppm of resveratrol;
• malvidin 3-glucoside at a concentration of at least 300 ppm,
• at least 50 ppm of quercetin and/or quercetin glycosides, and
• at least 500 ppm of anthocyanidins;
• and
• wherein the nutritional or therapeutic agent formulated as a tablet, capsule, gel capsule, microcapsule, suspension, emulsion, food supplement, drink or food for humans or animals.