Natures Way - Uva Ursi Standardized Extract Urinary Tonic - 60 Capsules Natures Way Uva Ursi Standardized Extract Urinary Tonic (Arctostaphylos uva-ursi) is standardized to 20% arbutins. Based on the antiseptic action of the leaves Uva Ursi was listed in the U. S. Pharmacopeia and National Formula
