Newswise — Today, the probiotic market is a $28 billion industry.

Some brands suggest that their probiotics can reduce the instance of colds and flu, suppress allergies and even regulate the digestive cycle.

Do these superbugs take root in our digestive system and improve our microbial health or are they kicked out by the bacteria that are already present?

Is there any credible evidence to support the claim that regularly consuming probiotics actually has a substantial health benefit?