The subjects will receive one bottle with 35 tablets [of either Ginseng G115 40 mg, multivitamin, mu ltimineral '+' Paullinia cupana extract PC102 75 mg (Guarana) or placebo] from the pharmacy at the in vestigational site. The subjects should take the study drug from day 0 to day 28 '(+/- 1)' Subjects will be assigned to one of the two treatment groups randomly. The allocation ratio is 2:1..