Colloidal Silver is one of the best antibiotic, anti-fungus products. It kills pathogens on contact. Personally, I use it on the throat if it is feeling itchy and already hurting. It helps to prevent if used early or speed up the time needed to recover. I find it works well on ulcers in the mouth too. It is also best not to take colloidal sliver continuously as it might kill off the beneficial bacteria. It does not kill them with infrequent usage though. This product contains 30 ppm (more than most products and not too high either) so the strength is guaranteed as well. Though this is a throat spray, it can be used externally to kill infections on wounds or fungus or yeast infections. Since this is a spray, this is convenient to bring along for travel. Pricewise, it is very cheap and will last a long time as you do not have to use it daily. Check out my page for more reviews!