Nocist Prevent NoCist Prevent is a food supplement in vegetable capsules, based on extracts of Cranberry (equivalent to 45 mg of PACs titrated with the BL-DMAC method) and Birch that favors the functionality of the urinary tract and the drainage of body fluids. . Contains N-Acetylcysteine. Instructions for use: it is advisable to take 2 capsules a day with a large glass of water, preferably at night before going to bed.