To be very honest, I forget that this is even a concern anymore.  I only remember when I hear it brought up, and who brings it up more than a simple search engine?  

Before we get to colloidal silver, we need to look at perspective with Tylenol.  Most take it without abandon, but there are 56,000 overdose ER visits, 26,000 hospitalizations, and 458 overdose deaths a year.  There is not one case of overdosing on colloidal silver; you would overdose on water before you would overdose on colloidal silver. There are no accounts of illness or mortality being caused by
colloidal silver except the very rare herxheimer reaction which can be caused by antibiotics, herbal remedies and some supplements too.  

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Colloidal Silver is basically a mineral water. There are two main types of colloidal silver, ionic silver and nanoparticle silver. Ionic silver is only pure silver and pure water. It should always be colorless and have a slight metallic taste. This is the type of silver most often sold commercially and it is most widely used. 

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In most reported cases of argyria, the person was drinking homemade ionic silver and often using salt to speed up the process. When salt is used it creates silver chloride, not colloidal silver. There was one case of localized argyria reported, caused by a silver cream prescribed by a doctor. 

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 “…you should be advised that we recently completed an extensive review of the scientific literature on the safety of silver, especially as it relates to its one known potential side effect, namely, Argyria. Argyia is an irreversible discoloration of the
pigment (skin) caused by excessive silver intake or chronic exposure to silver by certain tissues. The amount of silver required to develop Argyria is estimated to be 3.8 grams per day. By comparison standard 10 ppm colloidal silver contains silver in amounts equaling less than 1 milligram of silver (1,000 micrograms = 1 milligram; 1,000 milligrams - 1 gram), which therefore represents an amount approximately 1/500th to 1/1000th of the amount of silver considered to be a risk in the development of Argyria.

“Most cases of Argyria reported in the medical literature over the last 100 years involved chronic intravenous or intramuscular use of the silver preparations, most often involving a silver drug prescribed by physicians which in most cases contained silver nitrate. Other cases of Argyria reported in the medical literature involve application of silver preparations used for many months or years in the treatment of the eye or vagina for certain diseases. We could not locate a single case of orally consumed colloidal silver manufactured in the last 25 years causing Argyria in our review of the literature. This is probably due to the low levels of silver contained in such preparations, since only very small amounts of silver are needed for its antiseptic effect.

“Humans consume approximately 100 micrograms of silver every day in the diet. Additional amounts within this range would be considered safe by all reasonable estimates, especially if the amount needed to develop Argyria would be equivalent of 380,000 micrograms (or 3.8 grams) of silver a day.

“As for the efficacy of silver preparations, we found considerable scientific evidence published over the last 75 years that a number of silver compounds can be effective germicidal (antiseptic) agents against several hundred pathogenic organisms.
However, silver is not termed an antibiotic as some have claimed because an antibiotic by definition is derived from a living organism.” 

Sincerely,
Alexander G. Schauss, Ph.D.
Director, Life Sciences Division
John Hopkins University

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There are many documents and files out there to support these claims if you search.  But no, you won't turn blue.