Malaysia 121 human 112 Article 103 male 88 Humans 75 controlled study 72 female 72 adult 58 Male 54 nonhuman 54 TJ Mechanical engineering and machinery 49 Female 43 PERFORMANCE 42 unclassified drug 37 article 35 chemistry 32 middle aged 31 metabolism 29 major clinical study 28 aged 26 procedures 26 Animals 24 Middle Aged 24 animal 24 cross-sectional study 24 Adult 23 Performance. Competence. Academic achievement 23 animal experiment 23 high performance liquid chromatography 23 plant extract 23