Voortdurend worden er nieuwe studies gedaan naar de effectiviteit van cranberry’s ter preventie van urineweginfecties (blaasontstekingen). Deze moeten meer inzicht geven in wat een optimale dosis is en welk type preparaat het meest efficiënt is. Hierbij ligt de focus tot nu toe vooral op het gehalte van proanthocyanidinen die specifiek voorkomen in cranberry’s (type A PAC’s). Inmiddels is echter gebleken dat de werkzaamheid van cranberry’s niet alleen bepaald wordt door deze proanthocyanidinen. Van een aantal cranberryproducten met een relatief laag gehalte aan PAC’s is aangetoond dat ze zeker niet minder werkzaam zijn dan producten met een hoog gehalte.
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