chemistry 69 Article 49 controlled study 46 nonhuman 44 unclassified drug 43 human 39 Animals 35 animal 35 plant extract 35 Plant Extracts 32 metabolism 31 Humans 30 male 29 plant leaf 26 Male 24 animal experiment 24 drug effect 23 antioxidant 21 Plant Leaves 20 drug effects 20 antioxidant activity 19 mouse 19 Antioxidants 18 Mice 17 medicinal plant 17 animal model 16 flavonoid 16 animal cell 14 animal tissue 14 drug screening 14