Have you heard of postbiotics? The term has recently been appearing everywhere—in podcasts, on social media, and in health magazines. Yet very few people realize that your gut actually produces postbiotics on its own, provided it receives the right ingredients.

This is where things become particularly interesting. Probiotics, prebiotics, and postbiotics do not work independently—they function as an interconnected system. Once you understand how these three components interact, it becomes clear why synbiotics are currently receiving so much scientific and public attention.

In this article, you will learn:

• what postbiotics are and how they are produced in the gut,
• the differences between probiotics, prebiotics, and postbiotics,
• and why synbiotics are considered one of the most holistic approaches to supporting overall health and the gut–brain axis.
  

 

What Are Postbiotics?

Postbiotics are metabolic compounds produced by beneficial gut bacteria. In simple terms, your intestinal microbes ferment specific dietary fibers—known as prebiotics—and, during this process, generate bioactive substances that can influence your body in various ways.

The International Scientific Association of Probiotics and Prebiotics (ISAPP) defines postbiotics as:

"Preparations of inanimate microorganisms and/or their components that confer a health benefit on the host."

Unlike probiotics, postbiotics are not living microorganisms. This is one reason they are considered particularly stable and resilient.

Among the best-known postbiotics are the short-chain fatty acids (SCFAs):

• Butyrate
• Acetate
• Propionate

These compounds are currently a major focus of scientific research because they appear to play important roles in maintaining the intestinal barrier, supporting immune function, and promoting a balanced gut microbiome.

 

How Are Postbiotics Produced in the Body?

The key point is that your gut normally produces postbiotics by itself. However, this requires the right interaction between your diet and your microbiome.

The process can be simplified into three steps:

1. You Consume Prebiotics

Prebiotics are specific types of dietary fiber naturally found in plant-based foods. They serve as food for beneficial gut bacteria.

Well-known prebiotics include:

• Fructooligosaccharides (FOS)
• Inulin

These fibers naturally occur in foods such as:

• Chicory
• Jerusalem artichokes
• Onions
• Leeks
• Legumes
• Oats

 

2. Your Gut Bacteria Ferment These Fibers

Certain beneficial bacteria, including Lactobacillus and Bifidobacterium species, ferment these dietary fibers in the large intestine. This biological process is known as fermentation.

 

3. Postbiotics Are Produced as the End Products

As a result of microbial fermentation, various beneficial compounds are generated, including:

• Short-chain fatty acids such as butyrate and acetate
• Enzymes and peptides
• Antimicrobial substances and other bioactive molecules
• B vitamins and vitamin K

The most important concept to understand is this:

Without probiotics, there can be no postbiotics. And without prebiotics, probiotics lack the nutrients they need to produce them.

Therefore, postbiotics should not be viewed as an alternative to probiotics. Rather, they are the natural products generated when beneficial gut bacteria are metabolically active.

The system works only when all three components interact: Prebiotics + Probiotics = Postbiotics

 

What Is the Difference Between Probiotics, Prebiotics, and Postbiotics?

Although these three terms are often used interchangeably, they refer to different components of the same biological system.

Feature	Probiotics	Prebiotics	Postbiotics
What they are	Live beneficial microorganisms	Dietary fibers that serve as food for beneficial bacteria	Metabolic products produced by beneficial bacteria
How they work	Colonize and support the gut microbiome	Nourish beneficial bacteria	Act directly within the gut and may influence the body
Onset of action	Days to weeks	Immediately available as bacterial food	Immediately to within days
Natural sources	Yogurt, kefir	Chicory, onions, oats	Fermented foods such as sauerkraut and kimchi
In BioMe+	✓ Five scientifically selected strains providing more than 30 billion CFU	✓ FOS and inulin	Supports the natural production of postbiotics in the gut

 

The key message is simple:

• Probiotics are the beneficial bacteria.
• Prebiotics are the nutrients that feed these bacteria.
• Postbiotics are the valuable compounds produced when the bacteria metabolize those nutrients.

Rather than competing with one another, these three components work together as an integrated system.

 

What Do Postbiotics Do in the Body?

Research on postbiotics has expanded rapidly in recent years. In particular, short-chain fatty acids such as butyrate have become a major focus of scientific investigation.

While many underlying mechanisms are still being explored, several potential functions are considered especially relevant.

 

1. They May Support the Intestinal Barrier

The intestinal lining continuously regulates which substances are allowed to enter the body and which are kept out.

Between the intestinal cells are structures known as tight junctions—small connections that function as a protective barrier.

Research suggests that butyrate may positively influence these tight junctions, which is why it is frequently discussed in relation to increased intestinal permeability, commonly referred to as "leaky gut."

Current studies indicate that short-chain fatty acids may help support the integrity of the intestinal barrier.

 

2. They May Influence the Immune System

A large proportion of the body's immune system is closely associated with the gastrointestinal tract.

Postbiotics can interact with immune cells within the gut-associated immune system, potentially helping to regulate inflammatory processes.

Current research suggests that certain postbiotic metabolites may contribute to a more balanced immune response, although this area continues to be actively investigated.

 

3. They May Help Modulate Inflammation

Short-chain fatty acids activate specific receptors that are involved in anti-inflammatory signaling pathways.

For this reason, researchers are intensively studying the role that the microbiome and postbiotic compounds may play in chronic inflammatory conditions.

It is important to emphasize, however, that postbiotics are not a miracle cure. Rather, they may represent one component of a comprehensive, gut-friendly approach to health.

 

4. They May Support the Gut–Brain Axis

The gut and the brain are in constant communication through neural pathways, hormones, and immune signaling molecules. This bidirectional communication network is known as the gut–brain axis.

Consequently, scientists are currently investigating how the microbiome—as well as prebiotics, probiotics, and postbiotics such as short-chain fatty acids produced in the gut—may influence:

• Stress resilience
• Mood
• Sleep quality
• Mental well-being

Early studies have already identified promising associations between postbiotics and psychological well-being. Nevertheless, this is a rapidly evolving field, and much more scientific research is expected in the coming years.

 

Which Foods Contain Postbiotics?

Your diet has a greater influence on your gut microbiome than you might think. Two groups of foods are particularly important:

Fermented Foods

Fermented foods provide live microorganisms and, in some cases, already formed postbiotic compounds. Examples include:

• Sauerkraut
• Kimchi
• Kefir
• Natural yogurt
• Miso
• Kombucha

Prebiotic Foods

Prebiotic foods supply the dietary fibers that beneficial gut bacteria ferment to produce postbiotics. Excellent sources include:

• Whole grains
• Legumes
• Chicory
• Onions
• Leeks
• Oats
• Resistant starch from cooked and cooled potatoes or rice

If you find it difficult to incorporate a wide variety of these plant-based foods into your daily diet, a synbiotic supplement may help support the natural interaction within your gut microbiome.

What Are Synbiotics and Why Are They Considered Particularly Beneficial?

Once you understand how postbiotics are produced, it becomes clear why synbiotics are receiving so much attention.

Synbiotics combine probiotics and prebiotics in a single formulation. Put simply:

• Probiotics are the "workers."
• Prebiotics provide the "fuel."
• Postbiotics are the valuable end products created through this process.

This is why synbiotics are considered a particularly holistic approach:

• Probiotics alone require the appropriate nutrients to become metabolically active.
• Prebiotics alone may have limited benefits if beneficial bacteria are present only in low numbers.
• Only when both components work together can an environment be created in which postbiotics are naturally produced.

This concept is the foundation of BioMe+.

The synbiotic combines five scientifically selected bacterial strains:

• Lactobacillus rhamnosus
• Lactobacillus helveticus
• Bifidobacterium longum
• Bifidobacterium animalis
• Lactobacillus plantarum

together with the prebiotics fructooligosaccharides (FOS) and inulin.

In addition, BioMe+ contains magnesium, a mineral that contributes to the normal functioning of the nervous system. In the context of the gut–brain axis and stress management, this represents a valuable complementary component.

What makes this approach unique is that the focus is not on a single "super strain," but on the interaction between the microbiome, microbial fermentation, and the body's natural production of postbiotics.

For more information, visit Braingood.eu or explore Dr. Braingood, our AI system specialized in the gut–brain axis.