What are postbiotics?

From Nutritionist Emma

@emmatalksnutrition

What are postbiotics? We’ve all heard about probiotics, prebiotics, maybe, but postbiotics? I don’t hear much chat about postbiotics, and arguably, they’re the most magical of all. Probiotics + Prebiotics = ✨Postbiotics✨ Postbiotics are what make the gut such a powerful health resource. Postbiotics ingredients including L+ lactic acid or butyrate actively strengthen the gut barrier, calm inflammation, and support immune function, whilst also delivering systemic effects far beyond digestion. So, watch this space as I talk more about all things postbiotics, because let me tell you, we all need MORE! ?

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Qualified Nutritionist (BSc, MSc, RNutr)
@emmatalkshealth
@EmmaThornton
Ask Emma


28 May 2026

Postbiotics: The gut health hero you’ve probably never heard of

We’ve all heard about probiotics and prebiotics — but what about postbiotics? They may be the newest “biotic” on the block, but they could actually be the most powerful of them all.

First, let’s break down the biotics

Gut health can feel a little confusing when every wellness conversation includes another “biotic.” Here’s the simple version:

  • Probiotics are the beneficial bacteria living in your gut.
  • Prebiotics are the fibres that feed those bacteria — found in foods like onions, leeks, bananas, and oats.
  • Postbiotics are the beneficial compounds created when probiotics ferment prebiotic fibres.

In other words:

Probiotics + Prebiotics = ✨ Postbiotics ✨

So, what exactly are postbiotics?

Postbiotics are the end products of healthy gut activity. They include compounds like:

  • L+ lactic acid
  • Butyrate
  • Other short-chain fatty acids

These compounds help maintain the health of the gut lining and support the body far beyond digestion.

Why do postbiotics matter?

Postbiotics are one of the reasons the gut is such a powerful foundation for overall health. Research suggests they can help:

  • Strengthen the gut barrier
  • Calm inflammation
  • Support immune function
  • Promote wider systemic health benefits

And because gut health is closely linked to overall wellbeing, supporting postbiotic production may have effects throughout the body.

How can you support postbiotic production?

One of the best ways to encourage more postbiotics is by feeding your gut well. Foods rich in prebiotic fibre — like oats, bananas, onions, and leeks — help beneficial bacteria thrive and produce these powerful compounds naturally.

Watch this space…

Postbiotics may not be getting as much attention as probiotics just yet, but watch this space! There’s still so much to explore about how these compounds support our health — and why we could all benefit from a little more postbiotic goodness in our lives.


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