Busting Myths Around Probiotics

There’s quite a bit of information on probiotics out there these days, and some of it may not sound quite right. Today, we’ll set the record straight on a few common probiotics myths so you can make the right choices based on science, not hype.

Key Takeaways

• Most modern probiotic supplements don’t require refrigeration, but it’s always best to check the bottle label.
• A higher colony-forming unit (CFU) count doesn’t automatically mean a better blend. Instead, consider strains that are clinically studied to match your health goals.
• There’s no single perfect probiotic strain that’s right for everyone. Let your personal needs and goals inform which strains you select.
• Fermented foods are valuable natural sources, but supplements can offer more precision and consistency than food alone.

Key Terms

• Colony-forming unit (CFU): an estimate of the viable, living number of bacteria available in a supplement.
• Probiotic strain: used to distinguish between the various species of beneficial bacteria or yeasts found in the human digestive tract or added by supplementation.
• Shelf-stable probiotic: beneficial bacteria that can remain living, although dormant, at room temperature—no refrigeration needed.
• Live cultures: the living, active beneficial (probiotic) bacteria or yeasts found in supplements or fermented foods.

The 4 Probiotic Myths

Myth 1: All Probiotics Need to Be Refrigerated

Fact: While probiotic blends once required refrigeration, this is generally no longer the case. These days, the need for refrigeration varies from product to product, so it’s important to pay attention to the bottle label. If the bottle indicates refrigeration, then it should be refrigerated; if it doesn’t, it doesn’t. Swanson probiotics are shelf-stable and the supplement facts panel lists the amount of CFU included in the formulation at the manufacture date.

Myth 2: Higher CFU Count is Always Better

Fact: Although a larger colony-forming unit (CFU) count on the label can make a probiotic supplement seem like a better product, this isn’t exactly the case, as CFU is only one factor you should consider.¹ A better gauge is the included strains. Look for those that are clinically studied to match your health goals. Some strains are more studied for gut balance and regularity, while others promote a positive outlook or healthy skin.

Myth 3: One Probiotic Works for Everyone

Fact: Probiotics are beneficial by nature, but their benefits vary, just as one person’s goals can vary from another’s. Everyone’s gut microbiome is different depending on diet, genes, age, GI acidity, and countless other variables. The truth is that individual strains of probiotics have been studied for a variety of benefits,² so the best probiotic is the one that provides support for your personal needs. Check out 4 Steps to Choosing a Probiotic for more information on selecting the probiotics that are right for you.

Myth 4: Food Gives You All the Probiotics You Need

Fact: Natural food sources are always best for getting the nutrients your body needs, and certain foods do contain probiotics, such as yogurt or fermented items like sauerkraut or kimchi. However, the CFU and specific strains present in these foods can be difficult to pinpoint or confirm. Additionally, the amounts of these foods necessary to deliver efficacious amounts of probiotics are often far more than would be reasonable to eat regularly. Lastly, the preparation of many foods, such as pasteurization, can kill off live probiotic cultures (although this doesn’t mean removal of all benefits).³

The most precise way to make sure you’re getting the right amount of the probiotic strains you’re targeting is to find a high-quality probiotic supplement that can provide consistent, measurable dosages of the strains you want.

Frequently Asked Questions

• Are probiotic supplements right for everyone?

  Most healthy adults can safely take probiotic supplements, but those who are pregnant, nursing, or have specific health conditions or with weakened immune systems should speak with their doctor first. Probiotics are generally well-tolerated, though some people may experience temporary digestive disruptions at first.^1..

• Is the sugar in my probiotic drink or yogurt a problem?

  High sugar content in commercial probiotic products, including some flavored yogurts and kombucha drinks, can partially offset the nutritional benefits of probiotics. Look for plain or low-sugar versions or choose other sources if sugar content is a concern for you.

• Why do some doctors not recommend probiotics?

  Although probiotics are generally safe for most healthy adults,¹ there are some people who may have certain medical conditions or concerns identified by their doctor. As a general rule, it’s always best to talk with your health team before adding or changing any supplements in your wellness routine.

When it comes to probiotics, understanding the facts can help you choose a supplement that truly fits your wellness goals. By looking beyond common myths and focusing on clinically studied strains, quality, and consistency, you can make more informed decisions for your gut health. Ready to find the right probiotic for your routine? Explore Swanson’s full selection of high-quality probiotic supplements to discover targeted formulas designed to support your unique needs.

About Bushra Hassan, MBA, RD & LDN
Registered Dietitian & Licensed Dietitian Nutritionist

Bushra is an expert in supplement development, nutrition education, wellness coaching, and product brand management. Her work focuses on diet and nutrition, digestive health, and integrative and functional medicine. She enjoys baking, trying new restaurants, and exploring the beautiful city of Chicago.

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

1. Professional Fact Sheet (2025, March 05). Probiotics. National Institutes of Health. Accessed July 2026.
2. Ciorba, A. A Gastroenterologist’s Guide to Probiotics. Clin Gastroenterol Hepatol. 2012 Sep; 10 (9): 960-8.
3. Piqué, N., et al. Health Benefits of Heat-Killed (Tyndallized) Probiotics: An Overview. Int J Mol Sci. 2019 May 23; 20 (10): 2534.