plant extract Plant Extracts 143 unclassified drug 124 nonhuman 109 controlled study 107 chemistry 104 Article 91 human 74 plant leaf 70 antioxidant 66 male 61 Animals 58 animal experiment 58 Antioxidants 55 rat 55 Humans 54 metabolism 52 animal 50 animal model 49 antioxidant activity 44 drug effect 41 article 39 methanol 39 medicinal plant 38 Male 35 Rats 35 animal tissue 35 flavonoid 35 mouse 35 Plant Leaves 33