According the the NIH (National Institutes of Health), “Probiotics are live microorganisms that are similar to beneficial microorganisms found in the human gut. They are also called ‘friendly bacteria’ or ‘good bacteria’. Probiotics are available to consumers mainly in the form of dietary supplements and foods.”
Probiotics help keep our immune systems healthy by fostering a balanced gut ecosystem. Probiotics support an environment where a milieu of beneficial microflora thrive and pathogenic organisms (and their toxins) are kept in check.
By supporting a rich and diverse gut ecosystem with key beneficial strains, probiotics promote a healthy gut lining — where much of the immune system resides.
Conversely, without a healthy microbiome, the mucosal lining can become inflamed and compromised, precipitating a challenge to the immune system.