Charmaine:
I checked out that website and while it's not the most professional looking hoodia website, it appears they are probably selling 100% authentic hoodia gordonii. However, since there is very little factual evidence on the website that what they are selling is in fact real, I can't say for certain that it is.
As example, most websites that sell hoodia products have all kinds of documentation to "prove" that what they are selling is real. I only recommend 3 hoodia products because I know they are real as they have all the documentation to prove it and they all do random independent lab testing to test for authenticity. Those products are Desert Burn, Hoodia Hoodia, and Hoodoba. Desert Burn and Hoodia Hoodia don't ship to Australia but Hoodoba does. You can read more about these brands by reading the full reviews of each here:
http://hoodiaandweightloss.com/category/…
As you will see by reading those reviews, those sites certainly have all the documentation and "proof" that what they are selling is real. If you compare them to ozhoodia.com, you'll see why it's hard to say if what ozhoodia.com is selling is real or not.
What I would recommend you do is email them and ask them some general questions. See how long it takes to get a response and what kind of response you get. If you don't hear from them or if it takes a long time to get a reply - and if their reply doesn't make you feel comfortable, I wouldn't order from them.
P.S. I actually emailed the company myself as I am curious now too if what they are selling is real. If I get a response, I'll follow up here with a comment.
Best of luck to you.
Travis