Stress, lack of sleep, overwork, insufficient vitamins especially vitamins B are also among the causes of the problem. To solve the issue, it is highly recommended to exercise regularly for at least 3 times a week and 30 minutes for each session. Recreational activities and diets with sufficient nutrients as well as food with high vitamin B such as coarse rice can also help. Ohiocordyceps sinensis (Chang Cao) and ginseng are among medically proven herbs which strengthen and energize the body. Food with high zinc such as oysters, liver, and whole grains as well as food with high arginine amino acid such as pumpkin seeds, peanuts, soy beans, black sesame seeds, Spirulina can help with the sexual underperformance problem.