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The moment I start feeling cold symptoms--dry feeling in the back of my nose, tiredness, etc., I pour a little of my homemade colloidal silver in my hand and sniff it up my nose and tilt my head back a little to try to keep it in place, being careful not to choke on it.  I feel immediate results.  In a couple of hours I use it again just to be sure I get all those viruses and no more cold.  The first time I tried it, my nose was partially clogged and I got a sharp pain in my head for a few seconds.  That disappeared (and I didn't die of an anurism :)) and my nose became clear and after doing the colloidal silver treatment a couple more times, that cold was gone too.