1. Olthof MR, Hollman PC, Vree TB, Katan MB: Bioavailabilities of quercetin-3-glucoside and quercetin-4'-glucoside do not differ in humans. J Nutr. 2000 May;130(5):1200-3. doi: 10.1093/jn/130.5.1200. [PubMed:10801919 ]