Benefits of double root coffee to men helps boost fertility. increases libido level. heightens sexual desire. promotes semen quality. improves erectile function. increases testosterone level. increases stamina & endurance. usage description: 1 sachet once a week. but if taking one whole sachet causes headache for you, then you should take half of it, and the remaining half after 2 days. then you can take another one after 5 days of taking the 2nd half.and keep taking it half, each time. if no headache caused, you can keep taking a whole sachet once per week. to place order kindly drop down your name address and phone number and it'll be deliver to you. thanks.