Morinda citrifolia Linn or more popularly known as Noni is a fruit native to Southeast Asian tropical countries and Hawaii. It has a pungent smell and is not often consumed as a staple diet due to its numbing effects. However, its juice has been used for the past 2,000 years for a variety of ailments including diabetes, high blood pressure and drug-related psychiatric disorders.
A recent study involving apomorphine and methamphetamine-induced mice showed reduced psychosis when morinda citrifolia extract was introduced orally on a regular basis. The animals reportedly showed significantly decreased in apomorphine-induced cage climbing behaviour and significantly inhibited methamphetamine-induced stereotypy behaviour. The scientists suggest that due to the antipsychotic-like nature of noni extracts it could be used as treatment for psychiatric disorders and curbing drug addiction.