A nurse is reinforcing teaching with a client who has frequent urinary tract infections (UTIs). The nurse should identify that the client can use. which of the following herbal supplements to help prevent UTIs?

Cranberry juice is the correct answer because it contains proanthocyanidins, compounds that prevent certain bacteria — particularly Escherichia coli — from adhering to the urothelial cells lining the bladder and urinary tract. By inhibiting this bacterial adhesion, cranberry juice reduces the likelihood of colonization and subsequent infection, making it a recognized complementary strategy for preventing recurrent urinary tract infections. The evidence supporting cranberry is strongest for prophylaxis in women with frequent UTIs, and it is commonly recommended as part of client education. Echinacea is an herbal supplement primarily used to stimulate the immune system and is sometimes taken to reduce the duration of upper respiratory infections; it has no established mechanism for preventing UTIs. Saw palmetto is used to relieve lower urinary tract symptoms associated with benign prostatic hyperplasia in men, not to prevent infections. Black cohosh is an herbal remedy used to manage menopausal symptoms such as hot flashes and has no evidence base for UTI prevention. Students should note that while cranberry products are helpful adjuncts, they are not a substitute for medical treatment of active infections and should accompany, not replace, appropriate antibiotic therapy when a UTI is already present.