I'm not aware of any peer-reviewed evidence. The research I'm aware of is that you have to actually drink three jugs of cranberry juice if you really want to achieve any benefit from the claims that have been placed on these products.
I'm not saying that these products do not manage conditions or that they are not there to treat. They are.
I think that's what is really important. That's why it's very important that the claim has to be very clear and evidence-based and you can provide that information to your patient so the patient can use these products safely with their other prescription and non-prescription medications.