Quercetin*   A flavonol that works as an anti-carcinogen and and antioxidant, quercetin has also been shown to reduce the release of histamine and may be effective against allergies.  The quercetin content of Oregon caneberries (known date) is as follows: red raspberries, 12 milligrams per 100 grams of juice (about 3/8 cup) and Evergreen blackberries, 0.5-3.5 milligrams per 100 grams of fruit (about 3/4 cup).

*Information supplied by the Oregon Raspberry and Blackberry Commission