Numb It Injection 10mL Numb It is a proprietary formula and without question is the most powerful pain shot on the market today AND WILL NOT TEST! Dosage and Administration: Administer 10ml by intravenous injection as close to the event or extreme exercise as possible, but no closer than 1.5 hrs. You can administer Numb It as far out as 8-10 hrs. before the event with excellent effects. Numb It comes in a sterile 10ml vial for one time use.