Proanthocyanidins, or PAC, are the active ingredient found in cranberries that fight UTI-causing bacteria, helping to stop the bacteria from sticking to you (instead, bacteria are literally flushed away).
Only the PAC that come from concentrated juice extract have this power, because they are 100% soluble.The PAC in other urinary tract supplements come from the pomace (the skin, seeds, stems, and pulp of the berry) and pomace is not soluble, and therefore not effective.
