flavonoid article 34 nonhuman 30 controlled study 26 unclassified drug 26 Flavonoids 22 plant extract 16 priority journal 14 drug isolation 12 drug effect 10 human 10 metabolism 10 phytochemistry 10 quercetin 10 traditional medicine 10 unindexed drug 10 Animals 8 Dose-Response Relationship, Drug 8 Humans 8 animal 8 dose response 8 drug effects 8 flavonoids 8 human cell 8 kaempferol 3 o beta robinobioside 7 o alpha levo rhamnopyranoside 8 nicotiflorin 8 physiology 8 rutoside 8 short survey 8 2 (2 amino 3 methoxyphenyl)chromone 6