CFU stands for colony-forming unit—the standard way of measuring the quantity of live strains in probiotic supplements. It refers to the number of live, active microorganisms present in one dose of the Smart Probiotic.

As CFUs indicate the number of live microorganisms in a probiotic dose, larger numbers do increase the likelihood of an impact. However, CFUs aren’t the only thing to consider when choosing a probiotic. You should also consider the specific strains present, the science that backs up the probiotic, and the quality and care that goes into the production process.