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Mangosteen juice is a tropical fruit beverage made by liquefying the seeds, rind, and flesh of the Southeast Asian mangosteen. Mangosteens, Garcina mangostana, are native to countries such as Malaysia, the Philippines, and Thailand, although they are also cultivated in Brazil and India for American importers. They bottle the juice as a supposed miracle cure containing unprecedented amounts of antioxidants and xanthones.
The mangosteen is the size of an apple, with a thick rind, interior white segments like an orange, and large seeds. As with many fruits, the mangosteen is rich in vitamins and minerals, such as vitamin C, B1, B2, B6, potassium, iron, and calcium. The fruit is not widely available in America, so the juice must be imported. While nutritionists have not tested the countless claims of bottlers, many companies profess that this "Queen of Fruit" can cure everything from cancer to dysentery to bacterial infections. They base this on a few sporadic studies in the laboratory or on animals that have shown positive benefits of doses of xanthones and antioxidants, compounds found in various fruits.
No major studies on humans have proven that drinking mangosteen juice on a daily basis would offer significant improvement in illness. Increasing one's daily dosage of antioxidants, even from supplements, has been proven to boost our absorption of vitamins and therefore strengthen immunity, however. The difference between doubling the intake of antioxidants and increasing it tenfold has the same results. Therefore, this juice has no significant advantage over a healthy diet of fruits and vegetables rich in antioxidants, as yet.
As a folk remedy, mangosteen juice has been used for centuries in the fruit's native countries, like Thailand. It does appear to improve certain conditions, such as dehydration or diarrhea associated with dysentery, and as a topical poultice to keep cuts from getting infected. There's no proof to support it's widely advertised qualities as an anti-histamine, anti-aging ointment, antibiotic, anti-viral, or anti-inflammatory, however. It's unlikely that this juice offers cures, but it does make a sweet and tasty, if expensive, beverage.