1. Stalmach A, Mullen W, Barron D, Uchida K, Yokota T, Cavin C, Steiling H, Williamson G, Crozier A: Metabolite profiling of hydroxycinnamate derivatives in plasma and urine after the ingestion of coffee by humans: identification of biomarkers of coffee consumption. Drug Metab Dispos. 2009 Aug;37(8):1749-58. doi: 10.1124/dmd.109.028019. Epub 2009 May 21. [PubMed:19460943 ]
  2. Claudine Manach, Augustin Scalbert, Christine Morand, Christian Rémésy, and Liliana Jiménez: Polyphenols: food sources and bioavailability American Journal of Clinical Nutrition. May;79(5):727-747.
  3. Olthof MR, Hollman PC, Katan MB: Chlorogenic acid and caffeic acid are absorbed in humans. J Nutr. 2001 Jan;131(1):66-71. [PubMed:11208940 ]