plant leaf nonhuman 81 controlled study 77 plant extract 70 unclassified drug 70 Article 59 Plant Leaves 52 chemistry 46 animal experiment 42 male 41 Plant Extracts 37 animal model 35 rat 35 Animals 34 antioxidant 34 antioxidant activity 32 article 32 animal 30 methanol 29 Antioxidants 27 animal tissue 25 flavonoid 24 human 24 medicinal plant 24 metabolism 23 Male 22 phytochemistry 21 Rats, Sprague-Dawley 18 histopathology 18 IC50 17