this is just an excerpt but if you want to read the whole article it's at 
http://web.ask.com/redir?bpg=http%3a%2f%2fweb.ask.com%2fweb%3fq%3dbuy%2bpharmaceutical%2bgrade%2bsilver%2b99.999%26o%3d0&q=buy+pharmaceutical+grade+silver+99.999&u=http%3a%2f%2ftm.wc.ask.com%2fr%3ft%3dan%26s%3da%26uid%3d0FED6E75DA9D671E3%26sid%3d11504F4B7B43C49E3%26qid%3d69C2B48464139D4396CEB8C6C8956BF2%26io%3d1%26sv%3dza5cb0d89%26ask%3dbuy%2bpharmaceutical%2bgrade%2bsilver%2b99.999%26uip%3dcf5fe31e%26en%3dte%26eo%3d-100%26pt%3dIssue%2b1%26ac%3d24%26qs%3d14%26pg%3d2%26u%3dhttp%3a%2f%2fwww.natures-balance.com%2fNewsletter%2fIssue_1%2fissue_1.html&s=a&bu=http%3a%2f%2fwww.natures-balance.com%2fNewsletter%2fIssue_1%2fissue_1.html
  
another biggy!
Colloidal technology has advanced in leaps and bounds since the late 1930s. It 
is now possible to produce a 'true' electro-colloid of pure silver without 
using any stabilizers, acids or solvents. The patented SilverloidTM process 
creates a 'true' colloidal suspension of 99.999%-pure silver in purified 
deionized water.
'True' Colloidal Silver is completely safe, and mild enough to drop into the 
eyes and ears of infants suffering from conjunctivitis or middle-ear 
infections.  True colloids of 99.999%-pure silver will not cause Argyria 
(though all medicinal silver compounds should carry this warning on the label). 
Most products on the market today are still manufactured from mild silver 
protein
or ionic silver compounds. These are NOT suitable for regular or prolonged use.
The optimum concentration (established by the Colloid Research Foundation) is 
10-20 ppm (parts per million) with a particle size of 0.005 to 0.015 microns 
for products intended for therapeutic use.
.