6 Postbiotic Foods for Better Gut and Immune Health

Probiotics are the beneficial bacteria that support gut health, and prebiotics are the foods that help those bacteria grow. Postbiotics is a broad term for the compounds left behind after probiotics break down prebiotics.

What Are the Benefits of Postbiotics?

Research shows that these probiotic “leftovers”—such as short-chain fatty acids, enzymes, peptides, and other nonliving compounds—may have some health benefits. They could help reduce inflammation, keep the lining of the digestive tract healthy, and even play a role in the gut-brain axis.

Your body naturally produces some postbiotics through normal gut bacteria activity. Many foods already known for their prebiotic and probiotic benefits also contain postbiotics, providing yet another reason to include them in your diet.

1. Sourdough Bread

Making sourdough with lactobacillus bacteria involves fermentation, which creates ideal conditions for producing postbiotics. Baking kills the live bacteria, but their byproducts, such as metabolites, remain in the finished bread. 

The fiber in sourdough adds another benefit by supporting digestive health. That matters because the colon is where most gut bacteria activity takes place. If you don’t want to bake your own bread, choosing freshly baked sourdough from a local bakery or grocery store can still give your meals a postbiotic boost.

2. Fermented Vegetables

Fermentation isn’t the same as pickling in vinegar. When vegetables like cabbage or cucumbers are fermented, they’re brined and given time to break down their natural carbs and sugars into organic acids, gas, and even small amounts of alcohol.

This process is what makes fermented foods such as sauerkraut and kimchi so rich in beneficial bacteria and their byproducts. Fermented foods also contain lactic acid, which is central to the fermentation process and is often added by manufacturers to encourage postbiotic production.

3. Yogurt, Kefir, Buttermilk

Yogurt with live cultures, cottage cheese, and kefir offer beneficial bacteria and their byproducts, making them easy ways to start the day with a postbiotic boost.

Fermented dairy products also provide calcium, vitamin D, and other key nutrients, especially when fortified. Buttermilk is another underrated source of postbiotics. Producers add bacterial strains that ferment lactose, the main sugar in milk, which creates lactic acid and postbiotic compounds.

4. Aged Cheese

Certain cheeses also provide beneficial bacterial byproducts. Aged varieties such as Gouda, cheddar, and Parmesan contain lactic acid bacteria that leave behind postbiotics.

Food safety researchers have even studied these postbiotics for their potential antimicrobial properties, which may help extend a cheese’s shelf life.

5. Fermented Soy

Fermented soy products are staples in many cuisines because they’re flavorful and nutrient-dense. Miso, tempeh, and nattō are often recognized for their probiotic benefits, but they also contain postbiotics.

These foods are versatile: miso works well in soups, tempeh can replace meat or be crumbled over salads, and nattō offers a strong, protein-packed breakfast option.

6. Kombucha

Along with probiotics, kombucha also delivers postbiotics from the fermentation process. This beverage not only offers gut health benefits but also antioxidants from tea.