Food Intolerance/Allergy Testing?

[Axis]

I wasn't sure where to put this so please feel free to move if neccessary!

Has anyone ever done any salivary intolerance testing thru a naturopath - either in person or I do also beleive you can order testing kits online and have the results sent to you. My friend just used one in Perth and apparently they tested her saliva for 125 things. That was all done via mail. She is gluten intolerant and intolerant of several other things like a couple of colours etc.

I have been wondering alot lately about getting it done, both for myself and the kids. I really think my 4yo could have a dairy intolerance.

Does anyone have any experience/opinions? Mainly I'd like to know if its worth it, and if its a reputable way of being tested or if I should go down the track of blood testing, my GP I assume would be first port of call?