Not sure on that one, but I wouldn't dought it. Pomograntite has have been found to have 5 Xanthones. Natures super anti-oxidents. (While Mangosteen has over 43, no other fruit has as many Xanthones).
When purchasing any juice you need to read the main ingredient, make sure it is pure 100% pomagranite with no added artificial flavors or other junk.