These arguments go way back into history - If you do some simple research on the subject.
Sample Link:
http://www.clspress.com/History.html
I got mine from
http://www.ukcolloidalsilver.co.uk/ - they have been running for a very long time and claim that their process is one of the best.
I personally know that I don't need to take it regularly, but I know of people who do. And that reminds me, I should get myself a bottle...
It is good medicine.