 To compare the absorption and activity of quercetin or isoquercetin with or without ascorbic acid in healthy adults. Oral chews containing quercetin 500mg or isoquercetin500 mg total with or without ascorbic acid will be given. Pharmacokinetic parameters AUC, Cmax, Tmax, elimination half-life will be determined over 24 hours 8 time points. Pharmacodynamic inhibition of protein disulfide isomerase activity will also be assessed. 