Quick answer
Probiotics are live beneficial bacteria that populate your gut, while prebiotics are non-digestible fibers that feed those bacteria. Taking both together—often called a synbiotic—can support a balanced gut microbiome more effectively than either alone.
Why the distinction matters for your gut health
Many people assume probiotics and prebiotics are the same thing, but they play complementary roles. Probiotics introduce good bacteria into your digestive system, while prebiotics act as fertilizer to help those bacteria thrive. Without prebiotics, the probiotics you take may not survive or colonize as effectively.
A common misconception is that you only need one or the other. In reality, your gut microbiome benefits most when both are present. This is why some supplements, like OLLY Probiotic + Prebiotic, combine them into a single formula.
How probiotics work in your body
Probiotics are live microorganisms—often strains of Lactobacillus or Bifidobacterium—that help maintain a healthy balance of gut flora. They can support digestion, immune function, and even mood by competing with harmful bacteria and producing beneficial compounds.
When you take a probiotic supplement, the bacteria need to survive stomach acid and reach your intestines alive. This is why formulation matters, and why some products include prebiotics to enhance survival.
What prebiotics do that probiotics don't
Prebiotics are types of fiber that your body cannot digest, but your gut bacteria can. They selectively stimulate the growth and activity of beneficial bacteria already in your colon. Common prebiotics include fructooligosaccharides (FOS) and inulin.
By feeding the good bacteria, prebiotics help them multiply and produce short-chain fatty acids that support gut barrier health and reduce inflammation. This is a key reason why prebiotic benefits extend beyond just digestion.
Myth vs. Fact: Probiotics and Prebiotics
- Myth: Probiotics and prebiotics are the same thing: Fact: They are different but complementary. Probiotics are live bacteria, while prebiotics are food for those bacteria. Both are needed for optimal gut health.
- Myth: You only need probiotics to improve gut health: Fact: Prebiotics are essential for helping probiotics survive and thrive. Without them, the beneficial bacteria you consume may not establish a lasting presence in your gut. Look for supplements that include prebiotics, like OLLY Probiotic + Prebiotic, to maximize effectiveness.
- Myth: All prebiotics are the same: Fact: Different prebiotic fibers (e.g., FOS, inulin, GOS) feed different bacteria strains. FOS, used in OLLY Probiotic + Prebiotic, is well-studied for supporting Bifidobacteria and Lactobacilli growth.
Products that combine both
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Probiotic + Prebiotic: This gummy delivers a combination of live probiotics along with prebiotic FOS to help keep the gut microbiome thriving. It simplifies your routine by providing both probiotics and prebiotics in one serving, so you don't have to take multiple supplements to support gut balance.
Probiotic + Prebiotic
