https://www.hindawi.com/journals/bmri/2004/147439/abs/, Clifton, P.M.: Traubenkernextrakt hat das Potential, die kardiovaskuläre Funktion günstig zu beeinflussen.: Effect of Grape Seed Extract and Quercetin on Cardiovascular and Endothelial Parameters in High-Risk Subjects: Journal of Biomedicine and Biotechnology, Volume 2004, Issue 5, Pages 272-278.