What is all the hulabaloo when there is no scientific proof of it's efficacy. And Nigerians have jumped on the bandwagon to start sales. It is being touted as a miracle drug and quite expensive too. Please you people should rather explain how it works, how much it costs, the quantity usually needed for a cure and the duration it should be taken for a cure!
There are too many quacks around.

Never heard bout silver

Colloidal silver is a suspension of submicroscopic metallic silver particles in a colloidal base.
Colloidal silver is a broad spectrum anti microbial agent. It is highly effective against 650 disease organisms.
Below are some of the many health benefits of colloidal silver: • Natural antibacterial
• Natural antiviral
• Natural antifungal
• Strengthens your immune system
• Settles indigestion
• Helps you achieve deeper and more restful sleep
MORE ON ITS BENEFITS:•
One is its ability to fight infections. It has been used for that purpose for hundreds of years. It will certainly also help you cure your common cold.
You must understand, it is not a miracle cure. But compared to today’s modern medicine it is almost too good to be true. And there are other benefits of colloidal silver besides helping against viruses. You can use it to clean up nasty bacteria as well. It will take care of the ones in your body, even the ones like E.coli.
Another on the list of benefits of colloidal silver is the ability to fight those stubborn yeast infections.

*SIDE EFFECT - RARE: SKIN TURNING BLUE OR ARGYRIA (USING TOO MUCH CONCENTRATION OR DRINKING LITRES OF POOR QUALITY SILVER WATER)
SOURCE: COLLOIDALSILVERUSES.NET

Thanks[b]Omofranca[/b] for making emphasis on RARE.

A couple of urban legends about white ppl turning blue. However, as the story goes they soaked silver cutlery in acidic solutions and drank it for many years. The particles of silver must have been huge and very high in concentration as you rightly said.
that kind of thing is impossible with nano silver at less than 10ppm.
Theoretically, its also impossible for a BLACK MAN to have Argyria because the silver particles are unable to displace MELANIN the pigment which makes us black.
Whites have little or none of melanin in their skin.