How much blueberry's per day is good antioxidant?

Half a: pint or more would be good

2-3 cups per day: Research studies have proven benefit of eating the juice of 3/4 pound of blueberries a day for 12 weeks. 3 cups of fruit a day is recommended, though you can also include other anti-oxidant rich fruits like raspberries, blackberries, cherries and grapes. Even more fruit might help, though wise to choose less-sweet fruits like those mentioned. See http://tinyurl.com/ktfla for more on blueberries.