Hello, Nature's Bounty cranberry concentrated extract soft capsule is mainly produced in North America. It contains a special ingredient-concentrated tannic acid. From 1980 to the present, there have been multiple research reports showing that the tannins in cranberries have the effect of resisting the attachment of bacteria (especially E. coli) to mucosal cells. Therefore, cranberries are widely used to prevent or improve female urinary system diseases. Many European women regard cranberry extract as an essential dietary supplement and carry it with them at home and out. So the effect is quite good.