Postbiotics represent the next frontier in microbiome science. While probiotics introduce live bacteria and prebiotics feed them, postbiotics are the beneficial compounds that those bacteria produce. These include short-chain fatty acids, enzymes, peptides, and other metabolites that directly support gut health, immunity, and inflammation control. The advantage of postbiotics is that they provide the benefits of probiotics without the challenges of keeping live bacteria alive.
Quick Facts
Reading time: 12 min
Evidence level: Research-backed
Target audience: US & European consumers
What Are Postbiotics?
Postbiotics are bioactive compounds produced by probiotic bacteria during fermentation. They include short-chain fatty acids (SCFAs like butyrate, acetate, propionate), enzymes, peptides, teichoic acids, and bacterial cell wall components.
The International Scientific Association for Probiotics and Prebiotics (ISAPP) defined postbiotics in 2021 as 'preparation of inanimate microorganisms and/or their components that confers a health benefit on the host.'
Postbiotics offer several advantages over live probiotics: they are stable at room temperature, have a longer shelf life, are safe for immunocompromised individuals (no live organisms), and provide direct effects without relying on bacterial colonization.
- Bioactive compounds produced by probiotic fermentation
- Include SCFAs (butyrate, acetate, propionate), enzymes, peptides
- Stable at room temperature, long shelf life
- Safe for immunocompromised individuals
- Direct effects without requiring bacterial colonization
Health Benefits of Postbiotics
Postbiotics offer many of the same benefits as probiotics but through a different mechanism. Short-chain fatty acids, particularly butyrate, are the primary beneficial postbiotic compounds.
Butyrate is the preferred energy source for colon cells (colonocytes). It maintains gut barrier integrity, reduces inflammation, and may protect against colorectal cancer. A 2024 review in Gut Microbes analyzed 35 studies and found postbiotic supplementation significantly improved gut barrier function and reduced inflammatory markers.
Postbiotics also support immune function by modulating regulatory T-cells and reducing pro-inflammatory cytokine production. They may be particularly beneficial for individuals with IBS, IBD, or leaky gut syndrome.
- Butyrate: primary energy source for colon cells
- Maintains gut barrier integrity (prevents leaky gut)
- Reduces systemic inflammation
- Modulates immune T-cell function
- May protect against colorectal cancer
Postbiotics vs Probiotics: Which Is Better?
Postbiotics and probiotics serve different purposes. Probiotics introduce live bacteria that may colonize the gut and produce postbiotics over time. Postbiotics provide the beneficial compounds directly, without relying on bacterial survival or colonization.
Postbiotics may be preferable for: immunocompromised individuals (no risk of infection from live bacteria), those on antibiotics (live probiotics may be killed), people with sensitive guts who experience bloating from probiotics, and those seeking faster, more predictable results.
However, probiotics have decades more research and offer benefits that postbiotics alone may not provide, such as competitive exclusion of pathogens and production of vitamins. Many practitioners recommend combining both.
- Postbiotics: Direct effects, no live bacteria needed
- Better for immunocompromised and antibiotic users
- More stable and predictable than probiotics
- Probiotics: decades more research, may colonize gut
- Combination approach: take both for synergistic effects
Types of Postbiotic Supplements
Butyrate supplements (usually as tributyrin or sodium butyrate) are the most common standalone postbiotic. Butyrate is notoriously difficult to deliver to the colon, so enteric-coated or delayed-release formulations are preferred.
Heat-killed (tyndallized) probiotics, such as Lactobacillus plantarum L-137 (HK L-137) and Lactobacillus paracasei MCC1849, are well-studied postbiotic preparations. They retain the immune-modulating benefits of the original probiotics without requiring viability.
Fermented food extracts, such as those from fermented rice bran or fermented soy, provide a complex mixture of postbiotic compounds. These are less defined but may offer synergistic benefits.
- Butyrate (tributyrin/sodium butyrate): Primary postbiotic supplement
- Heat-killed probiotics: L. plantarum HK L-137, L. paracasei
- Enteric-coated formulations deliver butyrate to colon
- Fermented food extracts: complex postbiotic mixtures
- Look for third-party tested products
Choosing and Dosing Postbiotics
For butyrate supplements, the typical dose is 300-600mg of tributyrin (providing approximately 200-400mg butyric acid) daily. Enteric-coated capsules are essential to deliver butyrate to the colon rather than the stomach.
For heat-killed probiotic postbiotics, follow manufacturer dosing, typically 10-50mg daily. These are usually stable at room temperature and can be taken with or without food.
Top brands include BodyBio Butyrate (sodium butyrate), Microbiome Labs MegaPreBiotic (includes postbiotic compounds), and INVITE HEALTH Postbiotic. For tributyrin, Designs for Health Tributyrin is well-regarded.
- Butyrate dose: 300-600mg tributyrin daily
- Enteric-coated or delayed-release capsules essential
- Heat-killed probiotics: 10-50mg daily
- Take with food to reduce stomach irritation
- Top brands: BodyBio, Designs for Health, Microbiome Labs
Important Safety Note
This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider before starting any supplement regimen.
The Bottom Line
Postbiotics represent the next frontier in microbiome science. While probiotics introduce live bacteria and prebiotics feed them, postbiotics are the beneficial compounds that those bacteria produce. Understanding the science behind these products is essential for making informed health decisions.
For more information, explore our related guides, check our FAQ page, or browse our supplement glossary.
Frequently Asked Questions
Are postbiotics better than probiotics?
Neither is universally better. Postbiotics offer advantages for immunocompromised individuals, those on antibiotics, and people who experience bloating from probiotics. Probiotics have more research and may offer additional benefits through colonization and vitamin production. Many practitioners recommend combining both for synergistic effects. Postbiotics are a complement to, not a replacement for, probiotics.
What is butyrate and why is it important?
Butyrate (butyric acid) is a short-chain fatty acid produced when gut bacteria ferment dietary fiber. It's the primary energy source for colon cells, maintains gut barrier integrity, reduces inflammation, and may protect against colorectal cancer. Low butyrate levels are associated with IBS, IBD, and metabolic disorders. Supplementing with butyrate (as tributyrin) can directly support colon health.
Can postbiotics help with IBS?
Yes, postbiotics show promise for IBS. Butyrate supplementation has been shown to reduce IBS symptoms, particularly pain and bloating, in several clinical trials. Heat-killed probiotics like L. plantarum L-137 have also shown benefits for IBS-related inflammation. Postbiotics may be preferable to live probiotics for IBS patients who experience bloating from bacterial fermentation.
Do I need to refrigerate postbiotics?
Most postbiotic supplements do not require refrigeration because they contain no live organisms. This is one of their key advantages over probiotics. However, always follow the manufacturer's storage instructions. Butyrate supplements should be stored in a cool, dry place away from direct sunlight to prevent degradation of the enteric coating.