Silicea Cold sore lip gel is a licensed medical device for the treatment of Cold Sores. The active ingredient of Silicea Cold Sore Lip Gel is silica gel (silicic acid gel), a compound formed from silica & water. What makes silicea gel so special is it's unusually high bonding capacity with water & wound secretions. This means the secretions from the cold sore are bound to the gel & the blisters are systematically dried out. In this way the spread of the virus is inhibited & the tingling, burning & itching sensations are relieved & the healing process is accelerated.• natural action • works physically • also effective after break out • registered medical device • clinically proven • kosher certified