Supplement Facts Check

An independent audit of gut-health supplement labels

Most gut supplements make the same claims. Few tell you what is in the bottle.

Supplement Facts Check scores best-selling gut-health supplements on six yes-or-no questions about what their labels disclose: the exact doses, the specific forms, and whether any of it can be verified. The rubric was committed in public before any product data was collected, and every ruling made since is in the commit history.

Pilot stage. 3 products are scored so far, to test the rubric. The full sample is the top 30 of Amazon’s Best Sellers in Probiotic Nutritional Supplements as captured on 09/05/2026, and scoring of that sample has not started. Read these as pilot results, not a ranking.

Pilot results

Of 3 products scored, 0 disclosed an exact amount for every active ingredient, and a public third-party certificate of analysis could not be located for 3. The highest score was 2 out of 6.

Disclosure Facts
Physician's CHOICE Probiotics 60 Billion CFUPhysician's Choice · label captured 2026-09-07
Disclosure score2/6
  1. 1. Exact amount for every active ingredient0 ✗
  2. 2. Standardization percentage stated1 ✓
  3. 3. Chemical form or strain named0 ✗
  4. 4. Dose within the trial range0 ✗
  5. 5. Certificate of analysis is public0 ✗
  6. 6. Per-serving amounts are complete1 ✓
Each criterion scores 1 or 0. No weighting, no partial credit.
Why it scored this way →
Disclosure Facts
BIOMA ProbioticsBIOMA · label captured 2026-09-07
Disclosure score1/6
  1. 1. Exact amount for every active ingredient0 ✗
  2. 2. Standardization percentage stated0 ✗
  3. 3. Chemical form or strain named0 ✗
  4. 4. Dose within the trial range0 ✗
  5. 5. Certificate of analysis is public0 ✗
  6. 6. Per-serving amounts are complete1 ✓
Each criterion scores 1 or 0. No weighting, no partial credit.
Why it scored this way →
Disclosure Facts
Seed DS-01 Daily SynbioticSeed · label captured 2026-09-07
Disclosure score2/6
  1. 1. Exact amount for every active ingredient0 ✗
  2. 2. Standardization percentage stated1 ✓
  3. 3. Chemical form or strain named1 ✓
  4. 4. Dose within the trial range0 ✗
  5. 5. Certificate of analysis is public0 ✗
  6. 6. Per-serving amounts are complete0 ✗
Each criterion scores 1 or 0. No weighting, no partial credit.
Why it scored this way →

The six criteria

Each one scores 1 or 0. The maximum is 6. A product using a generic ingredient at a studied dose scores the same as one using a trademarked equivalent; price, taste and brand reputation are not scored at all.

1. Exact amount for every active ingredientNo proprietary blend appears anywhere on the Supplement Facts panel.
2. Standardization percentage statedWherever potency depends on a percentage, such as % withanolides, the label states it.
3. Chemical form or strain named“Magnesium glycinate,” not “magnesium.” For probiotics, every organism carries a strain designation.
4. Dose within the trial rangeThe disclosed dose falls inside the range human trials used for the outcome the product claims.
5. Certificate of analysis is publicA third-party certificate is reachable with no email gate and no account.
6. Per-serving amounts are completeServing size and servings per container are both on the panel.

Read the full methodology →

Check the work

Every score links to a dated screenshot of the label it was read from. Every dose range links to the trial it came from on PubMed. The dataset, the rubric and every revision to either are in a public repository, released into the public domain. If a score is wrong, the evidence to show it is one click away, and corrections are welcome.

The author owns a supplement brand that competes with products scored here. That is stated plainly, along with what was done about it, in the conflict-of-interest statement.