The present invention relates to a phytocomplex or natural concentrate rich in polyphenolic compounds, such as hydroxytyrosol and 3,4-DHPA-EDA, derived from the vegetation waters of oil-bearing olives or from olive pomace resulting from the olive milling process for use in the treatment and prevention of angiogenesis and inflammation. In particular, the angiogenesis and inflammation to which reference is made is pathologic angiogenesis and inflammation, for example that which sustains the development and spread of a tumor or angiogenesis and inflammation tied to non-tumor pathologies. The present invention further relates to a beverage comprising the polyphenol concentrate and the use thereof in the treatment and prevention of angiogenesis and inflammation.