Morinda citrifolia is a shrub or small tree in the family Rubiaceae which produces the noni fruit. Morinda citrifolia is native to Southeast Asia but has been extensively spread by man throughout India and into the Pacific islands as far as the Hawaiian Islands. In China, Japan and even Hawaii, various parts of the tree (leaves, flowers, fruits, bark) serve as tonics and to contain fever, to treat eye and skin problems, gum and throat problems as well as constipation, stomach pain, or respiratory difficulties. In Malaysia, heated noni leaves applied to the chest are believed to relieve coughs, nausea or colic. In the Philippines, juice is extracted from the leaves as a treatment for arthritis.
The noni fruit is taken, in Indochina especially, for breathing problem , lumbago and dysentery. As for external uses, unripe fruits can be pounded, then mixed with salt and applied to cut or broken bones. In Hawaii, ripe fruits are applied to draw out pus from an infected boil. Overripe fruits give extracts that regulate menstruation or ease urinary difficulties.
In the United States and Canada noni juice is being marketed as a health food item said to contain xeronine, and is usually sold at high prices as a specialty item. The noni juice is used to make drinks, such as that produced by Tahitian Noni, Inc.