Gut & Digestive Health
Explore digestion, bloating, probiotics, fibre and claims about the gut microbiome.
A change in gut bacteria or a laboratory barrier marker does not automatically mean fewer symptoms or better health. Our reviews distinguish strains, preparations, doses and studied conditions, so evidence for one application is not extended to every gut-health claim.
Questions to explore
- Are Postbiotics Really Better Than Probiotics for Gut Health? — WEAK. Certain inactivated bacterial preparations have evidence for particular benefits, including an IBS trial. That does not establish that postbiotics as a category work better than probiotics, or that any product labelled dead bacteria improves gut health.
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Ratings apply to the specific claim assessed. Read each investigation for its findings and limitations.
Does Oil of Oregano With Black Seed Oil Really Kill Infections, Heal Your Gut and Boost Immunity?
Individual ingredients have biological activity and some small human studies. That does not establish that an oral blend treats infections, repairs the gut lining or reliably prevents illness.
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Do Greens Powders Really Replace Vegetables and Improve Gut Health, Energy and Immunity?
Some blends provide nutrients, and small trials report selected signals. They do not demonstrate that a scoop replaces vegetables or reliably improves energy, gut symptoms and infection resistance.
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Does Sea Moss Really Improve Gut Health, Boost Immunity and Support Your Thyroid?
Sea moss contains nutrients and interesting polysaccharides. We separate that biology from human gut, immune and thyroid benefits, including iodine risks.
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Do Bovine Colostrum Supplements Really Heal Your Gut and Boost Immunity?
Colostrum has promising findings for selected gut-barrier markers and respiratory symptoms. Do those findings establish general gut healing and stronger immunity?
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Can Akkermansia Supplements Really Help You Lose Weight and Fix Your Metabolism?
Recent human trials make Akkermansia worth investigating. We separate reduced weight regain, a negative main metabolic endpoint and exploratory microbiome findings.
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Does Zinc Carnosine Really Heal Your Gut Lining?
WEAK — Broad gut-repair claims remain unproven. Small human studies support selected mucosal or permeability effects in specific settings; gastric treatment is a separate question.
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Does Creatine Make You Bloated or Cause Water Retention?
Does creatine cause bloating or water retention? Separate muscle water, scale weight, digestive discomfort and visible puffiness.
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Do Lymphatic Drainage Drops Really Detox Your Body and Reduce Bloating?
Lymphatic drainage is real, but do oral detox drops improve it? We separate clinical treatment, ingredient research, fluid retention and digestive bloating.
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Is Raw Milk Healthier Than Pasteurised Milk?
Is raw milk more nutritious or easier to digest? We assess those claims independently, then examine infection risk and the UK context.
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Fibermaxxing: Is More Fibre Better for Gut Health and Longevity?
WEAK — Ever-higher fibre targets are not reliably supported. Adequate, varied fibre intake has MODERATE support; type, tolerance and food source matter.
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Can Probiotics Fix Your Gut Microbiome? The Evidence
Some probiotics have useful, specific applications. That is a different claim from saying any capsule, gummy or drink can reset your microbiome.
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Do Parasite Cleanses Work? Evidence, Testing and Risks
Parasites are real, and some plants have antiparasitic activity. Does that establish that commercial cleanses treat hidden infections or explain common symptoms?
Read the evidence →Browse the complete Gut & Digestive Health collection →
The Evidence Shelf: Gut & Digestive Health
Choose a specific goal, such as bowel regularity. Generic probiotics are not recommended for a vague promise of universal gut health.
UK-led options. Evidence applies to the defined use; formulas and guidance can differ by country.
Evidence reviewed: October 2026. Ratings assess the stated intervention and outcome, not a brand. Product links here are ordinary links with no affiliate tracking. We have not laboratory-tested these products. Affiliate disclosure · How we assess evidence.