Yes, we've all seen these things. They range from things to make hairdos easier to do, to things to spray in cracks to make things waterproof, to copper-infused joint wraps.
As far as I can tell, none of the "As seen on TV" stuff is any better than things you can already get in the store and not pay astronomical shipping prices . Copper on the outside of the body does nothing. You have to ingest it to get it's benefits.
And the knives, pots, pans, cooking utensils, juicers, etc...meh, it's all selective.
Bottom line? Stay away from 'as seen on tv' stuff unless you can find it in your local Wal-Mart. Then you can get it at a fraction of what they want in price+shipping charges.
As Seen on TV is nothing but a rip-off.