Betel nut

The nut of the Betel or Areca catechu tree contains arecoline, a mild central nervous system stimulant.

Its widespread use and availability across India, Thailand, Indonesia and other Asian cultures, makes the betel nut the most widely used stimulant in the world. Arecoline can improve learning and memory as well as counteracting intestinal parasites.

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The betel nut is used widely in Asia

Regular use stains the mouth, gums and teeth a deep red. Excessive use can cause inebriation and dizziness. Long-term use may damage the teeth and soft tissue of the mouth. The nut can be bought legally in the UK.