This study was designed for 12-week randomized, double-blinded, placebo-controlled trial. Sixty subjects were randomly assigned to receive placebo (corn starch) or 500 mg KRG. Both group consumed 10 capsules per day, three times daily after breakfast (3 capsules), lunch (3 capsules) and dinner (4 capsules), and it comes to total 5.0g daily. Red ginseng and placebo capsules were provided by the Korea Ginseng Cooperation (KGC, Daejeon, Korea).