Dietary absorption profile, bioavailability of (poly)phenolic compounds, and acute modulation of vascular/endothelial function by hazelnut skin drink

•A hazelnut skin drink was tested in a single-blind, non-randomised unilateral cross-over trial.•Ten plasma and twenty-four urine hazelnut phenolic metabolites were identified and quantified.•Hazelnut skin phenolics were highly bioavailable.•No acute beneficial effect of the test drink on endothelial function was observed.