Cranberry extract is high in proanthocyanidins. Quest probiotic products are manufactured 100% in-house from proprietary probiotic master cultures with proven stability and survivability in the GI tract. Quest CranBiotix provides a blend of cranberry extract and lactobacilli bacteria; L. rhamnosus, L. acidophilus and L. casei lyophilised and encapsulated with guaranteed potency until the end of shelf life.