How will Cranberry & Buchu help me? Nature’s Sunshine combines cranberry juice concentrate with Buchu herb concentrate. Separate scientific studies have concluded that cranberry juice contains substances that alter the bacteria population in urine, and a special factor in the juice seems to make harmful bacteria less likely to cling to the surface of the urinary tract. Buchu’s powerful penetrating aroma is akin to peppermint. Careful processing reduces the liquid to a concentrated powder before encapsulation. The Urinary System The function of the urinary system is to produce and remove urine and to regulate the amount, alkalinity or acidity, and consistency of body fluids. Kidneys are designed to keep the blood clean, and spend every minute of the day filtering out impurities. However, like any intricate structure, they have limitations.