Provides the probiotic bacteria, Lactobacillus plantarum 299v, specialised strain for IBS (Prev. Lp299v) Quest probiotic products are manufactured 100% in-house from proprietary probiotic master cultures with proven stability and survivability in the GI tract. Quest L. Plantarum provides 2 billion lactobacillus Plantarum bacteria per capsule, lyophilised and encapsulated with guaranteed potency until the end of shelf life.