If just used when needed properly made ionic silver represents no risk. If however you need to drink large amounts over a period of years you should take a selenium supplement to protect against Argyria.
Fact: There has yet to be one single case of argyria attributed to the use of isolated Colloidal Silver , with a PPM Silver ranging between 5 - 20, regardless of the quantity and frequency ingested. Every reported case of argyria that we have found was eventually traced back to a silver salt, silver protein, or other poorly made, compound-rich product. Correction: The first case of argyria from electrically isolated silver has been reported and verified. 6 ounces of correctly made electrically isolated silver ( unknown PPM ), ingested daily for 3 years, caused a pronounced case of argyria, primarily visible on the throat area. Two other cases have been reported but not verified.