The investigators performed a 8-week, randomized, double-blind, placebo-controlled human trial to evaluate the efficacy and safety of Gynostemma Pentaphyllum(Dungkulcha) on alleviation of chronic stress-induced strain. The investigators measured decrement of body fat parameters, State&Trait version of STAI, Beck Anxiety Inventory(BAI), Hamilton Anxiety Inventory(HAM-A), and monitored their blood pressure.

Inclusion Criteria:

• Age 20-65 years with chronic stress( S-STAI score 40~60)

Exclusion Criteria:

• excessive physically chronic fatigue
• Subjects taking antidepressants, anxiolytics, hypnotics within the last 2 months prior to the study
• Cardiovascular disease
• Allergic or hypersensitive to any of the ingredients in the test products
• History of reaction to any of the test products or of gastrointestinal diseases such as Crohn's disease or gastrointestinal surgery
• Participation in any other clinical trials within past 2 months
• Renal disease
• Abnormal hepatic function
• Laboratory test, medical or psychological conditions deemed by the investigators to interfere with successful participation in the study
• History of alcohol or substance abuse
• Pregnancy or lacting women etc.