Astanga Hrudaya
कषायः पित्तकफहा गुरुरस्रविशोधनः। पीडनो रोपणः शीतः क्लेदमेदोविशोषणः॥२०॥
Actions of astringent taste – Kashaya Rasa Karma – Kashaya (astringent) balances Pitta and Kapha, it is not easily digestible; cleanses the blood, causes squeezing and healing of ulcers (wounds), has cold potency, dries up the moisture and fat, hinders the digestion of undigested food.
english translation