Research
Probiotic Research
Plain-language summaries of the published probiotic research. Every summary links to its primary sources, and we never present popularity as evidence.
- Read the research →
Prebiotics vs Probiotics
How international scientific consensus distinguishes probiotics from prebiotics: probiotics are live microorganisms, while prebiotics are substrates selectively utilized by host microorganisms, and products combining both are called synbiotics.
- Read the research →
Probiotics and Antibiotic Diarrhea
What two 2021 meta-analyses of randomized trials report about probiotics taken with antibiotics and the risk of antibiotic-associated diarrhea in adults, including dose and safety findings.
- Read the research →
Probiotics and IBS
What meta-analyses of randomized controlled trials report about probiotics and irritable bowel syndrome, including strain-specific effects on abdominal pain and overall symptom severity and important evidence limitations.
- Read the research →
Probiotics and Immune Health
An evidence-first look at what randomized-trial meta-analyses report about probiotics and immune health, focused on respiratory tract infections, with attention to the modest effect sizes and remaining uncertainties.
- Read the research →
Probiotics and Mental Health
An evidence-first look at what randomized controlled trials and meta-analyses report about probiotics and mental health outcomes such as anxiety and depressive symptoms, including where the gut-brain (psychobiotic) evidence is genuinely limited.
- Read the research →
Probiotics and Skin
An evidence-first look at what randomized-trial meta-analyses report about probiotics and skin, focusing on atopic dermatitis prevention and treatment, plus the limits of the current data.
- Read the research →
Probiotics and Weight
What randomized-trial meta-analyses report about probiotic supplementation and body weight, BMI, and related measures in adults with overweight or obesity, including the small and mixed nature of the effects.
- Read the research →
Probiotics for Women
What randomized-trial meta-analyses report about Lactobacillus-based probiotics for bacterial vaginosis in women, including cure-rate findings, safety signals, and the limits of the current evidence.
- Read the research →
Probiotics: How Many CFU?
What CFU doses of probiotics have actually been studied, and why the 'right' number of billion CFU depends on the strain and the endpoint rather than a single universal target.
- Read the research →
Probiotics: What Qualifies and Why Strain Matters
Probiotics are live microorganisms that confer a health benefit when given in adequate amounts, and their effects are strain-specific.