The effect of standardized ginseng extract on peripheral blood leukocytes and lymphocyte subsets: a preliminary study in young health adults.

The present study was undertaken in twenty young, healthy Thai males to investigate the effects of prolonged administration of standardized ginseng extract on peripheral blood leukocytes and lymphocyte subsets. The subjects were divided into two equal groups as ginseng and placebo groups. The first group received two capsules daily of standardized ginseng extract 150 mg per capsule for 8 weeks.