natural viogra is made of many kinds of natural herb essence without any side-effects. function: 1. 120 minutes multiple sex intercourse 2. 72 hours duration and vigor. 3. quick penis erection 10 minutes after dosing. 4. get 3 inches increased in penis length and 25% increased in penis girth 5.100% satisfaction usage&dosage: 0 to 30 minutes before sex activity. better effects could be gained if it is taken before eating any food. the effective time could last as long as 72 hours. specification: 400mg×4capsules precautions: 1. forbidden for people who have high blood pressure and heart diseases 2. do not take any other western medicine within 12 hours after taking this product 3. suited community: adult male (forbidden for people whose ages are under 18) shelf life: 24 months