I am not sure if this is a "reliable site" -- that's something you need to determine for yourself. I think it would be helpful for you to look around a little bit and to become familiar with what's out there.
I have looked at your posting history and it seems that you go to forums and demand information about where to buy supplements (as you have here) or answers to questions frequently. It is just as easy for you to Google "colloidal copper" as it is for me to do it, and my experience tells me that if you are serious about your health and changing it via the information at Curezone, you will take the initiative to do some of this research yourself.
If you buy it, why don't you report back and let others know how your experience was? My strong opinion is that half of the healing that goes on around here comes from making connections with others and being helpful to them -- always the best thing we can do for our bodies/minds/spirits.