methanol 64 Methanol 53 controlled study 44 plant extract 40 Article 39 unclassified drug 39 nonhuman 38 plant leaf 30 male 29 Plant Extracts 24 animal experiment 23 chemistry 22 antioxidant activity 19 animal model 18 antioxidant 18 rat 18 human 17 Animals 16 Antioxidants 15 flavonoid 15 animal 14 animal tissue 14 article 14 Flavonoids 13 Plant Leaves 13 high performance liquid chromatography 13 medicinal plant 13 mouse 13 Male 12 Methanol extract 12