I looked it up and found this story of a young woman in New York back in time maybe late 19th or early 20th, can't remember anyway she was putting it up her nose and she turned grey.  I don't remember the story well enough, but the point is argyria - the silver collects just below the skin, quite rare but there are some people prone to this.  and it's irreversible.  I decided to take it anyway.

the woman who told me about this said she put a small drop in each ear once a day for months and then one day she realised she wasn't hearing the tinnitus any more.