Concentrations [Mean (range)] and % occurrence of urine metabolites as determined by NMR.

*Concentration of metabolite (Mean ± SD) is expressed by µM.aThe mean daily vitamin B6 intake was well below the recommended dietary allowance for men and woman;bdepends greatly on amount of alcohol consumed;cafter administration of lactose;dafter administration of 1 g of coumarin;eAfter styrene exposure; andfafter consumption of chocolate.NA: not available; NA**: not available for healthy adults; ADP: Adenosine-5-diphosphate; HPHPA: 3-(3-hydroxyphenyl)-3-hydroxypropanoic acid; Oc: occurrence.