Colloidal Silver
Colloidal silver products can be found all over the internet and sold for a variety of prices. Do you go for the cheapest that you can find believing that they are all the same and that more expensive manufacturers are just trying to rip you off? The answer should be no, because many of the manufacturers do not actually make a silver colloid product and instead either sell a mild protein solution or they sell an ionic silver solution. Neither of these will provide the same benefits as true colloidal silver and they can be hard to tell them apart.
Ionic silver is probably the most common culprit as it is easy to make and there are even do it yourself kits for people to make their own ionic silver solution, but the manufacturers of these products call them colloidal silver kits, even though they do not produce silver particles.