Trust Your Gut: Build a Healthier Gut with Probiotics

Your gut is always active, working to absorb the nutrients you need to live and thrive, while also protecting the body against harmful microorganisms. As such, it’s home to trillions of microscopic bacteria and other microflora. Today we’ll explore how to build and maintain a healthy gut through diet, lifestyle, and proper supplementation.

Key Takeaways

• The gut microbiome affects digestion, immune function, and mood.
• Both probiotics (beneficial bacteria) and prebiotics (fiber that feeds probiotics), impact gut health.
• Probiotics are generally identified by their genus (Lactobacillus), species (acidophilus), and strain (LA-14).
• Top probiotic foods include yogurt, kefir, kimchi, sauerkraut, miso, and kombucha.
• Supplements allow targeted species type selection and promotion.
• Daily consistency is more important than any single dose.

Key Terms

• Gut microbiome—a complex ecosystem within the digestive tract containing trillions of microorganisms such as bacteria, viruses, and fungi.
• Prebiotic—fiber that the body doesn’t digest but which is consumed by probiotics, thereby helping them to proliferate in the gut microbiome.
• Symbiotic—in this context, an interdependent relationship between two or more different biological organisms in which both rely on the other for optimal functioning.
• Fermented food—products that undergo controlled microbial growth, where microorganisms like bacteria, yeasts, or molds break down natural sugars and starches.

Why Your Gut Microbiome Matters

Located primarily in the colon, your gut ecosystem includes trillions of microorganisms, with bacteria among the most abundant.¹ This ecosystem is influenced each day by factors like stress and diet, among others. When the microorganisms in the gut are in balance, with beneficial species (probiotics) proliferating, they can benefit the body in numerous ways, from nutrition to immune function. Emerging research is also exploring how the gut microbiome influences mood and cognitive function, as well as other aspects of cross-function interaction through various axes of communication. Learn more in Understanding the Gut-Brain Connection.

The Best Probiotic Foods

Building and maintaining a healthy gut involves nourishing the probiotics already present within the microbiome and adding to them with the right foods and supplements. Let’s look at some of the best foods for promoting probiotic proliferation.

Fermented Dairy Sources

• Yogurt: Look for “live and active cultures” on the label for best results but be watchful of the added sugar content. Healthy yogurt options may include probiotics such as Lactobacillus bulgaricus, Streptococcus thermophilus, Lactobacillus acidophilus, and strains of Bifidobacterium.²

• Kefir: A fermented milk drink with a more diverse microbial profile than yogurt.³ Kefir provides a wide array of beneficial probiotics that work together to promote gut health.

Fermented Plant-Based Sources

• Kimchi: A traditional Korean food made from salted and fermented vegetables. Rich in probiotics and great for digestive health.

• Sauerkraut: Naturally fermented cabbage with lactic acid and containing Lactobacillus bacteria to help balance your microbiome.

• Miso: Traditional Japanese seasoning made from soybean paste. Typically fermented with a grain like rice or barley to produce a probiotic-rich, gut-friendly food.

• Tempeh: A traditional Indonesian food made from fermented soybeans. Nutrient-rich and a good source of plant protein.

• Pickles: For best probiotic effect, choose pickles that have been fermented using brine (water and salt) instead of vinegar.

Keep in mind that uncooked and refrigerated versions of these foods are more likely to contain live probiotic elements than cooked or canned options.

Probiotic Beverages

If you prefer to sip your way to better gut health, consider kombucha. This flavorful beverage is made from sweetened tea that’s been fermented over time using a symbiotic culture of yeast and bacteria. Kombucha delivers a refreshing taste and important health benefits due to its natural inclusion of amino acids, active enzymes, probiotics, prebiotics, and various nutrients.⁴

Other options for probiotic beverages can include drinkable yogurts such as lassi, functional probiotic soft drinks, and water kefir. Always be mindful of the sugar content of probiotic drinks, as a high amount of sugar can offset some of the intended health benefits.

Prebiotic Foods: Feed Your Good Bacteria

Prebiotics is the term used to describe a type of fiber that the body doesn’t digest but which feeds and nourishes beneficial bacteria (probiotics). This is important because without the necessary fiber to feed on, probiotics aren’t as equipped to proliferate, negatively impacting microbiome balance in the gut.

You can learn more about how these elements work together in Prebiotics vs. Probiotics vs. Postbiotics.

Delicious natural food sources of prebiotic fiber include:

• Bananas

• Onions

• Garlic

• Chicory root

• Whole grains

• Beans

• Asparagus

• Leeks
  

How to Build a Gut-Supporting Daily Routine

Food First, Supplement Second

If you regularly consume yogurt, kefir, kimchi, or other fermented foods plus a fiber-rich diet with prebiotic vegetables, your diet is already doing a lot of the work! Probiotic supplements are most useful when diet is inconsistent, after antibiotic use, or when targeting a specific area of digestive wellness with a particular probiotic. Just remember: supplements aren’t a replacement for a varied diet; they’re a complement to it.

Choosing a Supplement

Look at strains and counts. How many different types of bacteria does a particular supplement offer? What is its colony-forming unit (CFU) count? It’s worth noting that a higher CFU on the label doesn’t indicate on its own whether or not a product matches your goals.

Probiotic supplement blends can focus on certain health areas like our Happy Microbiome Stress Support Probiotic - Featuring Cerebiome, or on certain groups of people like our Women’s Daily Probiotic + Prebiotic FOS, all supporting a variety of health goals. A helpful tip for beginners is to look for products with clearly listed strains relevant to your goals rather than focusing on the highest CFU number only. Learn more in The 4 Steps to Choosing a Probiotic.

Consistency Matters Most

For best results with probiotic supplementation, keep in mind that daily intake over time matters more than occasional high doses. Consistency is key! And while the time of day that you take your probiotics may not make much of a difference, it’s worth noting that taking probiotics with or near a meal containing fat may support the bacteria’s journey through stomach acid to the gut.⁵

Frequently Asked Questions

• Why are probiotics good for gut health?
  Probiotics help maintain a healthy balance of beneficial bacteria in the gut, which supports digestive function, nutrient absorption, and immune health. The gut microbiome also communicates with the brain via the gut-brain axis, meaning gut health has potential effects on mood and cognitive function.¹
• How long does it take for probiotics to improve gut health?
  The timeframe can vary by person and specific benefit. Digestive changes may be noticed within a few days of consistent use. Mild discomfort may be experienced while the gut shifts, this will pass. Broader microbiome shifts can take longer, with research typically showing changes over a few weeks to months of daily supplementation.⁶

Start Building Your Healthier Gut Today

Promoting gut health is a daily practice that includes a diet featuring a combination of fermented and prebiotic foods, a quality supplement, and consistency over time. At Swanson, we’re pleased to offer many high-quality probiotics designed with your needs in mind, along with a selection of healthy food options to boost your overall health and wellness. For more on probiotics and what they can do for you, be sure to check out What Are Probiotics?

Swanson

These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.

Sources

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3. Azizi, F., et al. Foods. 2021 May 27; 10 (6): 1210. Read source
4. Massoud, R., et al. Plant Foods Hum Nutr. 2024 Jun; 79 (2): 251-259. Read source
5. Tompkins, A., et al. Benef Microbes. 2011 Dec 1; 2 (4): 295-303. Read source
6. Rakel, D. Promoting a Healthy Microbiome with Food and Probiotics. US Dept. of Veterans Affairs. 2025. Accessed June 2026. Read source