Catechins are flavonols that support the antioxidant defense system.  Catechins found in caneberries are very similar to those found in green tea which studies show may contribute to cancer prevention.  The catechins content found in 100 grams (about 3/4 cup) is as follows: red raspberries, .83 milligrams and Evergreen blackberries, 1.4 milligrams.

* Information supplied by the Oregon Raspberry and Blackberry Commission