I believe they confirmed it was xylitol with LC-MS to validate it: > Subsequent stable isotope dilution LC-MS/MS analyses (validation cohort) specific for xyli

I believe they confirmed it was xylitol with LC-MS to validate it: > Subsequent stable isotope dilution LC-MS/MS analyses (validation cohort) specific for xylitol (and not its structural isomers) confirmed its association with incident MACE