How we review supplements
Gut Label Check is an independent website about gut health supplements. We are not owned by any supplement brand. Our job is to tell you what the label, the seller’s own policies and the research actually say.
What we check for every product
- The label. We find the Supplement Facts panel on the official website and read it: ingredients, amounts, serving size, warnings and allergens. If the seller doesn’t publish a label, we say so.
- Doses vs. research. We compare each amount with the doses used in human studies and in clinical guidelines. Proprietary blends hide individual amounts, but labeling rules require blend ingredients to be listed from most to least by weight. That often lets us estimate an upper limit.
- Real cost per day. We divide each bundle price by the number of days it lasts, and add shipping where it applies.
- Refund fine print. When does the window start? Do you return opened bottles? Who pays return postage? Does the advice on how long to use the product fit inside the window?
- Marketing claims vs. evidence. We look for the study behind each headline claim. We also open the seller’s reference list to see whether the papers are relevant at all.
How we rate: the Label Check Facts panel
Each product page has a panel styled like a Supplement Facts label. It rates five things, each as Good, Mixed or Poor. We don’t add the ratings up into a single score, because a perfect refund policy doesn’t make up for a dose that is far too small.
| What we check | ✓ Good | ~ Mixed | ✕ Poor |
|---|---|---|---|
| Full ingredient list published | The complete Supplement Facts panel is on the official site | Partial list, or only shown in a video | No ingredient list we could find |
| Every dose shown | An amount for every ingredient | Some amounts, plus a blend | One “proprietary blend” total |
| Doses near research levels | Key ingredients at or near the doses used in human studies | Some at research levels, others well below | Key ingredients far below research doses, or no human research |
| Refund terms | Window long enough for the advised trial, free returns | Fair window, but with costs or conditions for you | Short window, no refunds on opened bottles, or unclear terms |
| Headline claim backed by a study | The main sales claim cites a relevant human study | A study exists, but on a different dose or product | No source for the main claim |
Where our facts come from
- Official product websites: labels, prices, shipping and refund policies. Every page shows the date we checked them.
- Peer-reviewed research and systematic reviews, linked on each page.
- Clinical guidelines, such as those of the American Gastroenterological Association and the American College of Gastroenterology.
- Government sources: NIH Office of Dietary Supplements, NIH NCCIH and the FDA.
What we don’t do
- We don’t lab-test products. Our analysis is based on published labels, policies and research.
- We don’t claim to have used a product unless we really did.
- We don’t publish customer testimonials, invented reviews or star ratings without a stated method.
- We don’t give medical advice. If you have symptoms, especially warning signs like blood in the stool or unexplained weight loss, see a doctor.
How we make money
Some links on this site are affiliate links. If you buy through them, we may earn a commission at no extra cost to you. We only earn if you buy, which is a conflict of interest. Our answer to it is to stick to facts you can verify yourself and to report the downsides as plainly as the upsides. Full details are on our disclosures page.
Updates and corrections
Prices, labels and policies change. Each page shows when it was last updated and when prices were checked. If you spot an error, email contact@gutlabelcheck.com and we’ll check it and correct the page.