Microbiome health

Does your gut need a probiotic?

There is no official recommendation that healthy people routinely use probiotics. These live microbes can benefit health, but the particular strain and reason for use matter. 1

Probiotics and prebiotics: what is the difference?

Probiotics contain living microorganisms. Prebiotics, such as inulin, provide fuel for microorganisms in the digestive tract; products combining both are often called synbiotics. 2

Which benefits have actually been studied?

Evidence concerns particular symptoms and conditions. NCCIH cautions that a result for one probiotic cannot be assumed for another. 3

ProbioticsMixed

Certain preparations may reduce antibiotic-associated diarrhea. Effects in irritable bowel syndrome depend on the strain and symptoms studied. 2

Dietary fiberToo little evidence

Gut microbes ferment some fibers and produce short-chain fatty acids. This biological process alone does not establish a supplement benefit for a particular symptom. 4

What can food contribute?

The German reference is at least 30 g of fiber daily for adults. Varied plant foods supply different fibers; fermentation may also cause gas. 4

What matters on the label?

A higher microorganism count does not automatically mean more benefit. Strain names, storage instructions and the use-by date are more useful than a large number alone. 1

Who needs extra caution?

Serious illness or weakened immunity can increase the risk of serious adverse effects from probiotics. NCCIH advises against using them to replace proven treatment or delay medical care. 3

What this page covers

This profile focuses on fiber and probiotics; it does not review every ingredient marketed for the microbiome.

Questions people ask