mangosteen juice - health product?

i have been buying mangosteens, mainly from sheng siong, since the season started sometime in march. i pay between $1.80 and $4.00 per kilogram for this fruit. when it first started appearing in the fruit section, most of the mangosteens were from malaysia, then followed by those from indonesia. lately, most the mangosteens are from thailand. i prefer the thai variety. the malaysian version is just as good.

i do not buy much, usually less than a kilogram - about 12 to 15 fruits. this is because i am the sole consumer of the fruit. at home, fruit is not a very popular food item. once in a while, ida and her mother will take the cut mango pieces or the red seedless watermelon pieces but nobody else touches the mangosteens but myself. however, of late, lay bee has mentioned that she would like to eat mangosteens.

that's where i found out that she has been hearing or reading about the merits of taking mangosteen juice, specifically xango juice. appended below is the claims made by the xango people:

xango®juice boasts a proprietary whole–fruit formula, harnessing a concentrated rush of xanthones—a vigorous family of next–generation phytonutrients. sounds complex. research shows xanthones possess potent antioxidant properties that may help maintain intestinal health, strengthen the immune system, neutralize free radicals, help support cartilage and joint function, and promote a healthy seasonal respiratory system.

here's what someone who is skeptical about the xango claims has to say:

fruit drinks are often healthful beverages. but the only reason i can see that the promoters of mangosteen can get away with charging us$37 for this product is that they are playing on patients' hopes and fears in a cynical way. without the health claims, open or implied, the product could only be sold for at most $5 or $6 (which, for example, is the cost of antioxidant-rich pomegranate juice).