Thanks Kriminal. Thanks anon too for the extra link. I'll add that to the list I've got. I got the other links from another forum a while back, so it's good to find out more. I dont know which ones are best, I've not ever ordered them myself from overseas. I get mine from a lab here in my own country (new zealand). Hopefully they are ok. I'd say they must be because they're the sources people get on another forum and nobody seems to have complained yet.