If it is banned I will go out on my limb and state it would not have been for not saying what was in it.
Look at all the other soil conditioners that don't say what is in them. Yet Superthrive actually has a decent run down of it's ingredients

My understanding is only fertilisers are made to display their analysis.
The only thing I can find from google is from a stoner website that was last year stating that all PGR's where banned
So if super thrive was banned for that then I would imagine that the stronger concentration PGR's such as rooting hormones would also have to be banned. Then again for that reason so would seasol
Please fill us in where this info came from Leigh and if any reason was given?
Edit: Apparently there was a rumor going around that Superthrive was banned in Canada but no one ever found any evidence of this and retailers continue to get in new shipments.
It's too bad your in such a hurry cause the stories I could tell you, Bushels and baskets of stories, hole crates full of stories. But if you can spare a moment I will tell you one story.