Mangosteen? What´s a mangosteen? This ultra-tropical superfruit isn´t well known in the U.S., but its not-too-sweet, exotic taste is unlike any other. High in antioxidants it´s praised as a magical cure all. Blended with mouth-watering, fragrant fruits like pineapple, passionfruit, orange and apple then lightly sweetened with Truvia®, made from the stevia plant, all that´s missing from this 40-calorie cocktail is crashing waves.—and sand between your toes.