Blackberries are rich in polyphenols, including anthocyanins. Polyphenols are hypothesized to have biological activities that may impact positively on human health. In these studies, an anthocyanin-rich extract from Hull blackberries grown in Kentucky was obtained and fully characterized in terms of total anthocyanin and phenolic content, polymeric color, anthocyanin composition, and total antioxidant capacity. In vitro cell culture studies showed that the blackberry extract inhibited HT-29 colon tumor cell growth in a concentration-dependent manner with 49.2 microg of total anthocyanins/mL inhibiting HT-29 cell growth up to 66% at 72 hours. Likewise, in a concentration-dependent manner, total anthocyanin concentrations in the range of 0-40 microg/mL suppressed both high-dose (10 microg/mL) and low-dose (0.1 microg/mL) lipid A-induced interleukin-12 release from mouse bone marrow-derived dendritic cells. These results suggest that Hull blackberry extract (HBE) has potent antioxidant, antiproliferative, and anti-inflammatory activities and that HBE-formulated products may have the potential for the treatment and/or prevention of cancer and/or other inflammatory diseases.