Abstract: This invention relates to polyphenolic compounds, in particular ethoxylated polyphenolic compounds and the use of such compounds in disease prevention, disease treatment, and life extension in humans and animals. The invention also relates to methods of preparing ethoxylated polyphenolic compounds, and preparation of compositions comprising the compounds, including dietary supplements and foods. The inventors describe how modified C-glycosidic ellagitannins are safe, palatable and effective at medium and high doses, and produce broad and profound health outcomes in mammals.