I have heard in the past that people can make it incorrect and thereby cause some problems with taking it. That is why I get mine direct from a company that makes it and they make it alot, so they know what they are doing. It is called Silver Hydrosol and they make it at 11 ppm. I give it to myself, my wife and my daughter all the time for lots of stuff. I even put some in my 3 year old neice for an eye infection. I think a lot of crap people say about it comes from the fact that the medical community does not want competition for their drugs. If you take Colloidal Silver s correct and not misuse it, it is fine.