> A different model suggests that very low levels are either benign Nothing in what others have said suggests low levels are deadly or even likely to be damagi

> A different model suggests that very low levels are either benign Nothing in what others have said suggests low levels are deadly or even likely to be damaging, at leas not over the time frame of a human life as defined by the many things that can take us out. > or even helpful. A larger amount of something being damaging does not rule out a small amount being helpful, there just comes a point when the potential danger starts to outweigh the potential benefits. Water is very beneficial, necessary in fact, but too much of it over a short time will kill you.