Bell J.R., Donovan J.L., Wong R., Waterhouse A.L., German J.B., Walzem R.L., Kasim-Karakas S.E. (2000) (+)-Catechin in human plasma after ingestion of a single serving of reconstituted red wine. Am J Clin Nutr 71:103-8 PubMed (10617953)

Compound Mean content
(+)-Catechin 35 mg/120 mL
(-)-Epicatechin 1 mg/120 mL