The areca nut is the seed of the areca palm (Areca catechu), which grows in much of the tropical Pacific, Southeast and South Asia, and parts of east Africa.
Areca nut is harmful substance but some compounds may have a positive effects and could be used in medicine. Areca nut is widely used in TCM. It's antibacterial, anti parasitic, anti-inflammatory and analgesic substance. Also, its been used for treatment of schizophrenia and glaucoma.