I read a thread on here from a year ago but it didn't exactly address my question, which is: I've got 500ppm colloidal silver that I want to use in my nebulizer for bronchitis. I'm not sure exactly how low I should go as far as dosage. Any suggestions for me?

Something more in the range of 25 ppm to 30 ppm will be plenty effective in a nebulizer.

I don't think that 500ppm will be a problem and I don't think it has to be diluted

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The only way to verify the strength is to measure it with a tds meter.

If it is indeed 500ppm, then dilute an equal amount with distilled water. That would make it a 250ppm solution, which is strong enough to kill any pathogen, since 1ppm will kill all bacteria in raw river water..

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Let Food Be Your Medicine And Medicine Be Your Food.(Hippocrates)