Clearly, the supplement is nothing more than a scam. Before buying such a product, any person should ask the obvious questions, such as, "Are they any actual studies which give reason to believe this 'supplement' is legit?"
After a quick search on Wikipedia and a few journal databases, the answer appears to be no. In fact, all of the information I found says quite the contrary. Especially in the article "Severe generalized argyria secondary to ingestion of colloidal silver protein" (from Clinical & Experimental Dermatology, Volume 28, Number 3.) Here's a bit of the abstract:
Basically, this supplement turns you into a walking photograph.
Argyria is a rare cause of cutaneous discolouration caused by silver deposition. We report a case of dramatic and diffuse argyria secondary to ingestion of colloidal silver protein over a 1-year period. Stained electron microscopy with spectral analysis was used to confirm the clinical diagnosis. Silver–protein complexes are deposited in the skin and reduced to inert silver salts by sunlight in a process similar to that harnessed in photography. Our patient had obtained the silver for consumption via mail order. It had been advertised as a cure for a variety of diseases...
So it's not that I expect Karason to research every single supplement he plans to use (at least try Wikipedia though), it's that he should concede the fact that he's wrong in saying his colloidal silver isn't the cause of his blueness. Defending a supplement simply because you have some attachment to it despite evidence saying you should do otherwise seems a little silly.