MONIN CHATEAUD Precyst Flash Herbal food supplement 60 capsules Precyst is used to treat urinary problems. Precyst is a food supplement containing proanthocyanidins and probiotics. Cranberry helps prevent recurring urinary problems by limiting the attachment of the E. Coli germ to the bladder wall. Bearberry contains arbutin, a natural source of urinary hydroquinones. The cause is often an imbalance in the intestinal and vaginal bacterial flora. Lactobacillus rhamnosus is a probiotic that can help restore this balance.