Bioavailability of epicatechin and effects on nitric oxide metabolites of an apple flavanol-rich extract supplemented beverage compared to a whole apple puree: a randomized, placebo-controlled, crossover trial.
Hollands WJ, Hart DJ, Dainty JR, Hasselwander O, Tiihonen K, Wood R, Kroon PA. Bioavailability of epicatechin and effects on nitric oxide metabolites of an apple flavanol-rich extract supplemented beverage compared to a whole apple puree: a randomized, placebo-controlled, crossover trial. Mol Nutr Food Res. 2013 Jul; 57(7):1209-17.