Skyhi, I have done a little bit of reading up on it this morning. There are not a lot of clinical trials that have been done I can find.
From what I have read, I gather it is a very concentrated fruit juice. It seems to claim most of its benefits from anti-oxidants, which of course, are also present in fruit and vegetables. Given the cost involved in buying a bottle (about $45 for 750 mls) it may be cheaper and just as effective to eat heaps of fruit and veges.
This is a link that talks about how it's made and what is it in, so it may be interesting reading.
link [www.entertheknow.com]