Plant Extracts plant extract 143 chemistry 99 Animals 58 human 57 nonhuman 55 Humans 54 controlled study 54 unclassified drug 53 antioxidant 51 metabolism 51 Antioxidants 49 animal 49 Article 43 male 41 Male 38 drug effect 37 plant leaf 37 rat 37 Rats 35 animal experiment 35 Plant Leaves 33 Rats, Sprague-Dawley 31 animal model 30 antioxidant activity 26 Sprague Dawley rat 24 flavonoid 24 high performance liquid chromatography 24 isolation and purification 23 methanol 23