Humans article 42 plant extract 40 human 36 unclassified drug 30 Plant Extracts 28 controlled study 28 nonhuman 28 Animals 26 human cell 24 chemistry 16 animal 14 drug effect 14 drug isolation 14 Cell Line, Tumor 12 Molecular Structure 12 in vitro study 12 Antiviral Agents 10 Plants, Medicinal 10 animal cell 10 antiviral activity 10 chemical structure 10 concentration response 10 drug structure 10 isolation and purification 10 Dose-Response Relationship, Drug 8 Fruit 8 Herpesvirus 1, Human 8 IC 50 8 cell viability 8