Areca catechu གོ་ཡུ་

English name: Betel nut

Tibetan name: Go-yu (གོ་ཡུ་)

Part used: seeds and sap (འབྲས་བུ་དང་ཚི་བ་)

Taste and potency: astringent and bitter taste (རོ་ཁ་ལ་བསྐ་བ་); hot post-digestive taste (ཞུ་རྗེས་ཚ་བ་); cooling and dry potency (ནུས་པ་བསིལ་ལ་སྐམ་པའོ་)

Profound value of Areca catechu in Tibetan Medicine:

• Urinary problems: difficult and painful urination, urinary retention ( ཆུ་བསགས་པ་). Urinary tract infections and parasitic infections ( ཁོང་སྲིན་གྱི་ནད་). 
• Kidney disorders: lower back pain, swellings and oedema. “Cold” kidney disorders with swelling of the face, eyelids, ankles and legs. Kidney injury and pain ( མཁལ་མ་ན་བ་). 
•  Wind: helps those who are under constant stress, who have too many anxious and disturbing thoughts, inability to concentrate or unstable mind ( སེམས་འཆོལ་བ་). Has slight stimulating effect. 
• Colours the teeth in red (སོ་རྩི་སྲུང་བ་)