 The purpose of the study is to evaluate the effect of G on human semen. The study is a pilot study, designed as open-label, prospective randomized clinical trial using G either 500mgcapsule panax ginseng 0.96gday or 1000mgcapsule panax ginseng 1.92gday, two capsules at once, three times a day for 12 weeks. GIlhwa, Republic of Korea is a dietary supplement capsule, which is made with 6 year-old Korean red ginseng Panax ginseng. Expected participants are to be male partners of female patients who visit infertility clinic at Severance hospital, whose total motile sperm count is more than 0.5x106 by semen analysis using computer aided sperm analyzer CASA. Semen analysis, blood test, questionaires are planned to be performed 2 times, on the initial visit and after 12weeks of G treatment. Semen analysis will reveal ejaculated volume, sperm count, motility, morphology, total leukocyte count, total motile sperm count, further analysis including sperm chromatin assessment to examine the quality of sperm and malondialdehyde MDA analysis of seminal fluid to assess oxidative stress will be performed. Blood test will be done including serum follicle stimulating hormone FSH, luteinizing hormone LH, total and free testosterone. Quality of life, sexual performance before and after taking G will be evaluated using questionaires. 