Ito H., Gonthier M.P., Manach C., Morand C., Mennen L., Remesy C., Scalbert A. (2005) Polyphenol levels in human urine after intake of six different polyphenol-rich beverages. Br J Nutr 94:500-9 PubMed (16197573)

Compound Mean content
(-)-Epigallocatechin 3-O-gallate 452.2 mg/g dry weight
(-)-Epicatechin 3-O-gallate 162.1 mg/g dry weight
(-)-Epigallocatechin 10.4 mg/g dry weight
(+)-Epicatechin 70.2 mg/g dry weight
(+)-Catechin 48.1 mg/g dry weight