I can't recall where I got this from.  Of course, "ppm" would need to
be converted to a measure of daily mass of silver intake somehow.
This could be used as a comparison.

"Some foods accumulate silver, eg mushrooms may boost silver
consumption up to between 200 to 300ppm per day. Approximately 10% of
orally-ingested silver enters systemic circulation and of that, up to
98% is gathered up by metallothioneins, which transport, store and
detoxify essential and nonessential trace metals (Silver, The
Healthful Metal, Silver Institute, Wash, December 31, 1999). Argyria,
a bluish-grey discoloration of the skin, although not aesthetic, is
extremely rare, is “non-pathogenic” / “medically benign” and a daily
ingestion dose of 1-30gram would be required to induce the condition
(Fowler B, Nordberg G, “Silver”, in Handbook on the Toxicology of
Metals, Friberg L et al, eds. Elsevier Sci Pub, Vol 2, 521-31, 1986);
(US EPA, Integrated Risk Information System: ‘Silver’, 1998).
Approximately 3.5gram daily over an entire lifetime will be required
to cause argyria, according to a year 2000 estimate by international
trace mineral expert, Prof Alexander Schauss, PhD, Director of Life
Sciences at John Hopkins University, in response to FDA proposals,
which is 10,000 times that advocated."

~David


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