Postbiotics
Beneficial compounds produced by gut bacteria during fermentation (such as short-chain fatty acids), or inactivated bacterial fragments with health effects.
After probiotics (live bacteria) and prebiotics (their food), postbiotics complete the picture. They are the end products of the microbiota’s activity: beneficial metabolites (short-chain fatty acids, vitamins, neurotransmitters) and fragments of inactivated bacteria (cell walls, enzymes).
The original angle (the effect without the live bacteria): an elegant and recent concept: many of the benefits attributed to probiotics may in fact come from what the bacteria produce (postbiotics), not from their mere living presence. This opens up a fascinating possibility: getting the benefits without needing live bacteria.
Practical advantages of postbiotics:
- More stable than probiotics (no need to keep bacteria alive, and they withstand storage and stomach acid)
- Safer for vulnerable or immunocompromised people (no risk of infection from a live bacterium)
- Targeted effects: the active compound can be delivered directly (for example butyrate)
Butyrate, the star postbiotic: the emblematic example: this short-chain fatty acid, produced by the fermentation of fibre, is a postbiotic with major effects (it feeds the cells of the colon, is anti-inflammatory, strengthens the gut barrier and helps regulate appetite). It is also found ready-made in butter and some cheeses.
How to boost your postbiotics: the most natural and effective way is not to buy postbiotics, but to feed your microbiota so that it makes them itself:
- Eat a wide variety of fibre and prebiotics (the fuel for the producing bacteria)
- Eat fermented foods (which supply postbiotics directly)
- Resistant starch and polyphenols
The complete quartet: prebiotics (food) → probiotics (bacteria) → postbiotics (beneficial products), all forming the microbiome ecosystem. Synbiotics combine prebiotics and probiotics.