Not all probiotics are created equal. Probiotics can be beneficial, but they also have some key limitations. Certain factors can limit the viability of a probiotic, including the acidity of the product, the presence of other bacteria, processing and storage conditions, and resiliency of the probiotic strain. Resilience refers to its ability to colonize the gut after passing through the acidic environment of the stomach. Additionally, to be effective, probiotics need to have excellent stability throughout the shelf life