Headline findings
What 18 best-selling gut supplement labels actually disclose
Six yes-or-no criteria, 18 products scored so far. Each finding below has its own page listing every scored row, the reasoning recorded against it and the date the label was read, so any figure here can be checked against the evidence it came from.
Pilot stage. The sample is the top 30 of Amazon’s Best Sellers in Probiotic
Nutritional Supplements, captured 09/26/2026. Every inclusion and exclusion decision is on the
results page. These are pilot results, not a ranking, and no product was lab-tested.
None of 18 publish a publicly accessible third-party certificate of analysisCriterion 5: Certificate of analysis is public. See all 18 rows →
Just one of 18 discloses a dose inside the clinical trial rangeCriterion 4: Dose within the trial range. See all 18 rows →
Only 7 of 18 disclose an exact amount for every active ingredientCriterion 1: Exact amount for every active ingredient. See all 18 rows →
12 of 18 state the standardization percentageCriterion 2: Standardization percentage stated. See all 18 rows →
12 of 18 name every chemical form or probiotic strainCriterion 3: Chemical form or strain named. See all 18 rows →
12 of 18 state both serving size and servings per containerCriterion 6: Per-serving amounts are complete. See all 18 rows →