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Old 29.05.2006., 20:15   #44
Colloidal silver in the proper size particle and within safe parts per million ratios have been effective against many bacterial issues. Unfortunately, more is not necessarily better and some products have too high a ppm and/or too large silver particles...which can lead to potential trouble...as indicated below. - ed

The metal silver can kill bacteria and is often used for this purpose in water purifiers. Based on this fact, silver- containing supplements are widely marketed for the prevention and treatment of numerous diseases. However, there is no real evidence that such supplements provide any benefit, and they can produce a peculiar and permanent side effect called argyria.

Medicinal silver is most often sold as colloidal silver protein (CSP). In a recent case report, a 56-year-old man noticed a blue discoloration under his fingernails.1 He had been taking CSP supplements daily for 3 years, in hopes of preventing colds and allergies. The diagnosis was argyria, a blue-black tinting of the skin and mucous membranes caused by a build-up of silver. Numerous similar cases have been reported in recent years.2,3

In argyria, silver deposited in the body reacts with the sun through a process similar to that of the development of a photographic negative. This leads to permanent discoloration of the skin. Changes may be seen in the eyes, lips, and nose as well.

The condition was even more common in decades past, when CSP was an accepted medical treatment. Fortunately, argyria is seldom dangerous, although in some cases nerve damage may occur.

Under current law, supplements may not be taken off the market until they are proven dangerous. Thus, it is up to consumers to protect themselves. We advise that you avoid products containing CSP unless you don't mind turning permanently blue!

1. Gulbranson SH, Hud JA, Hansen RC. Argyria following the use of dietary supplements containing colloidal silver protein. Cutis. 2000;66:373ñ374, 376.

2. Fung MC, Bowen DL. Silver products for medical indications: risk-benefit assessment. J Toxicol Clin Toxicol. 1996;34:119ñ 126.

3. Chomchai S, Kim SY. Argyria secondary to chronic ingestion of colloidal silver [abstract]. J Toxicol Clin Toxicol. 2000;38:552ñ553.
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