Probiotics vs. Prebiotics: Clinical Applications
High CFU counts on a generic probiotic bottle mean very little. We explore strain specificity, survivability, and why prebiotics often yield superior long-term results.
The CFU Myth in Probiotics
The supplement industry heavily markets "Colony Forming Units" (CFU). A bottle with 50 billion CFUs looks impressive compared to one with 10 billion. However, clinically, the sheer volume is irrelevant if the strains do not survive gastric acid, or if they aren't the specific strains your microbiome requires.
When you utilize a test like Floré, they analyze your specific deficiencies and compound a bespoke probiotic. Taking a generic 50B CFU multi-strain probiotic is akin to throwing random seeds onto a lawn without knowing what the soil lacks.
Strain Specificity is Everything
Saying you are taking "Lactobacillus acidophilus" is like saying you are driving a "Ford." Are you driving a Fiesta or a Mustang? The effects are entirely different. The nomenclature requires the strain identifier (e.g., Lactobacillus rhamnosus GG). Clinical studies validate the efficacy of the strain, not just the genus and species.
Prebiotics: Feeding the Native Flora
While probiotics introduce exogenous bacteria (which mostly pass through transiently), prebiotics are specific fibers that selectively feed the endogenous (native) beneficial bacteria already present in your gut.
Companies like ZOE heavily emphasize dietary prebiotics over probiotic supplementation for long-term microbiome diversity.
| Prebiotic Fiber Type | Food Sources | Primary Beneficiary |
|---|---|---|
| Inulin / FOS | Chicory root, garlic, onions, asparagus | Bifidobacteria species |
| Resistant Starch (RS3) | Cooled potatoes, unripe bananas, cooked/cooled rice | Butyrate producers (Faecalibacterium prausnitzii) |
| GOS (Galactooligosaccharides) | Legumes, certain dairy | Lactobacilli, Bifidobacteria |
The SIBO Caveat
If you have SIBO, taking prebiotics like Inulin or eating resistant starch will rapidly exacerbate your symptoms. Prebiotics feed bacteria regardless of where they are located. SIBO must be eradicated before introducing significant prebiotics.