It's an amazing fruit shown to fight cancer, boost heart health and more. Also known as the “queen of fruits,” mangosteen has been used to naturally . added to smoothie recipes for a strong punch of nutritional benefits. The rind of a garcinia mangosteen is deep red-purple when the fruit is ripe. Garcinia It is believed that Queen Victoria loved this fruit because of its taste and health benefits. . It's small, but packs a punch. There's research. Mangosteen juice may be an expensive way to make yourself sick. The fruit itself is good for you (so long as you don't eat the rind!) The punch line: A randomized controlled trial looked at the effects of hydroxycitric.