Headline finding · criterion 2 of 6
12 of 18 best-selling gut supplements state the standardization percentage
12 of the 18 best-selling gut-health supplements audited by Supplement Facts Check state the standardization percentage wherever potency depends on one. The other 6 do not: an ingredient whose potency depends on a percentage carries no percentage.
Criterion 2: Standardization percentage stated
Wherever potency depends on a percentage, such as % withanolides, the label states it. It scores 1 or 0, with no weighting and no partial credit, under methodology v1.14, locked 2026-10-26. Read the full methodology →
All 18 scored products
Every row that went into the figure above, with the reasoning recorded for this criterion and the date the label was read. Each product links to its full scorecard and the dated label captures the score was read from.
| Product | Criterion 2 | Total | Reasoning recorded for this criterion | Label captured |
|---|---|---|---|---|
| Align Probiotic Bloating Relief + Food Digestion Align | 0 ✗ | 2/6 | Enzyme potency is expressed in activity units (alpha-amylase in DU, protease in HUT, lactase in ALU, cellulase in CU, lipase in FIP), not in milligrams. A combined weight with no activity declaration cannot be converted into the unit the evidence uses, which is the functional test stated in the methodology. Same judgment as the BIOMA XOS row; flagged on the same basis. | 2026-09-27 |
| Lemme Debloat Digestive & Gut Health Gummies Lemme | 0 ✗ | 2/6 | XOS is declared as 80 mg with no purity percentage. This is the same case as BIOMA, where commercial XOS is sold at graded purities from roughly 35 to 95 percent and the reference range is expressed as XOS rather than as extract weight. Scored consistently with that row. | 2026-09-27 |
| BIOMA Probiotics BIOMA | 0 ✗ | 1/6 | IXOS xylooligosaccharide declared as 100 mg of corn cob extract with no XOS purity percentage; commercial XOS is sold at graded purities and the 1.4-8 g/d reference range is expressed as XOS, so potency depends on a percentage the label omits. Judgment call — flagged for review, as the criterion's stated examples are herbal marker compounds. | 2026-09-07 |
| Doctor's Recipes Women's Probiotic Doctor's Recipes | 0 ✗ | 1/6 | Organic Cranberry Extract is declared as 50 mg of extract with no proanthocyanidin percentage. Cranberry is the textbook standardized botanical, its urinary-tract literature doses in mg of PACs, and 50 mg of unspecified extract cannot be converted into that unit. This is a cleaner instance of the same functional test applied to BIOMA's XOS. The Prebiotic Fiber Blend compounds it by naming no ingredients whatsoever. | 2026-09-27 |
| Garden of Life Dr Formulated Probiotics for Men Garden of Life | 0 ✗ | 1/6 | Resistant starch is sold at graded RS content and its trials dose in grams of resistant starch, so a percentage is potency-determining under the functional test. Neither the percentage nor the potato starch weight is disclosed, since it sits inside a blend total. This extends the BIOMA judgment one step further, where 100 mg of corn cob extract was at least stated; flagged for review on the same basis. | 2026-09-27 |
| Garden of Life Dr. Formulated Kids+ Probiotics Garden of Life | 0 ✗ | 1/6 | The prebiotic blend contains Organic Whole Cranberry and Organic Emblic (Amla) Extract, both standardization-dependent (cranberry by proanthocyanidins, amla extract by tannin or vitamin C content), and neither carries a percentage or even an individual weight. Same basis as the Doctor's Recipes row. | 2026-09-27 |
| Florastor Probiotic Florastor | 1 ✓ | 5/6 | No standardization-dependent ingredient in the formula. | 2026-09-26 |
| Align Probiotic Pro Formula Align | 1 ✓ | 4/6 | No standardization-dependent ingredient in the formula. | 2026-09-27 |
| Digestive Advantage Probiotic Gummies Digestive Advantage | 1 ✓ | 4/6 | No standardization-dependent ingredient in the formula. | 2026-09-27 |
| MaryRuth Organics Kids Probiotics MaryRuth Organics | 1 ✓ | 4/6 | No standardization-dependent ingredient in the formula. | 2026-09-27 |
| Culturelle Daily Chewable Probiotics for Kids Culturelle | 1 ✓ | 3/6 | No standardization-dependent ingredient in the formula. | 2026-09-27 |
| Culturelle Pro Strength Probiotics Culturelle | 1 ✓ | 3/6 | No standardization-dependent ingredient. The probiotic is CFU-declared and inulin is named as the compound with its source in parentheses, so the quantified item is the inulin, not an extract of graded purity. This is the distinction from BIOMA, where the label declared 100 mg of corn cob extract rather than a stated XOS weight. | 2026-09-26 |
| Nature's Bounty Probiotic Acidophilus Nature's Bounty | 1 ✓ | 3/6 | No standardization-dependent ingredient in the formula. | 2026-09-26 |
| NOW Supplements Probiotic-10 NOW Foods | 1 ✓ | 2/6 | No standardization-dependent ingredient in the formula. The actives are live organisms quantified by strain and CFU rather than by a marker compound, so no percentage is required. | 2026-09-27 |
| NewRhythm Probiotics 50 Billion CFU NewRhythm | 1 ✓ | 2/6 | This is a judgment call worth stating. No ingredient identified on the panel is standardization-dependent: the actives are live organisms, and the prebiotic blend names nothing that requires a marker percentage. The criterion says in terms that a product scores 1 by default when nothing in the formula requires a stated percentage. The uncomfortable consequence is that a blend disclosing no ingredients cannot be shown to need a percentage, so non-disclosure is not penalised here. That non-disclosure is already captured, heavily, by criterion 1, and scoring it twice would double-count one failure. Flagged for review. | 2026-09-27 |
| Phillips' Colon Health Daily Probiotic Phillips' | 1 ✓ | 2/6 | No standardization-dependent ingredient in the formula. | 2026-09-27 |
| Physician's CHOICE Probiotics 60 Billion CFU Physician's Choice | 1 ✓ | 2/6 | No standardization-dependent ingredient in the formula. | 2026-09-07 |
| Seed DS-01 Daily Synbiotic Seed | 1 ✓ | 2/6 | MAPP pomegranate extract stated as >40% polyphenolic + phenolic bioactives — an earned point, not the default. | 2026-09-07 |
See these rows in the dataset →
Citing this finding
The sentence above is generated from the dataset at build time, so it cannot drift from the rows listed on this page. Quote it as:
12 of the 18 best-selling gut-health supplements audited by Supplement Facts Check state the standardization percentage wherever potency depends on one. Supplement Facts Check, methodology v1.14, labels captured 2026-09-07 to 2026-09-27. https://supplementfactscheck.org/findings/standardization-percentage-stated.html
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