Punarnava (Boerhavia Diffusa) – Uses, Properties, Benefits & Dosage Introduction Punarnava is one of the amazing herb in Ayurveda. It is effective to treat large number of diseases. It is the best natural diuretic and beneficial in renal and urinary conditions. It is also used for the treatment of liver disorders such as hepatitis and jaundice. Description of Punarnava Plant Punarnava is a perennial diffuse herb that has a horizontal stem that is usually purple. Plant length about 0.75–1 m.