blackberry

Ellagitannins, proanthocyanidins, anthocyanins, & other flavanoids in berrys are poorly absorbed & highly metabolized. Parent compounds, metabolites & conjugates detectable in human tissue.

References

Seeram NP Dietary polyphenols from berry fruits: metabolism and health Aging: Mechanisms and Prevention 34th Annual Meeting of the American Aging Association June 3-6, 2005, Oakland CA