Thanks
Dietitian, Nutritionist
This is not a straightforward question to answer. There is doubt over whether cranberries actually are effective for this at all. Recent research has cast further doubt. See http://www.webmd.com/news/20121016/cranberries-unlikely-prevent-utis
If they do help in preventing UTIs at all, it is not established what dose or way of extracting the active ingredients should be.
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