Head to head
Nature's Bounty Probiotic Acidophilus discloses more: 3 out of 6 against 2. That is a statement about NOW Supplements Probiotic-10's label, not about the product.
| Criterion | Nature's Bounty Probiotic Acidophilus | NOW Supplements Probiotic-10 | Agreement |
|---|---|---|---|
| 1. Exact amount for every active ingredient No proprietary blend appears anywhere on the Supplement Facts panel. | 1 ✓ | 0 ✗ | differ |
| 2. Standardization percentage stated Wherever potency depends on a percentage, such as % withanolides, the label states it. | 1 ✓ | 1 ✓ | same |
| 3. Chemical form or strain named “Magnesium glycinate,” not “magnesium.” For probiotics, every organism carries a strain designation. | 1 ✓ | 1 ✓ | same |
| 4. Dose within the trial range The disclosed dose falls inside the range human trials used for the outcome the product claims. | 0 ✗ | 0 ✗ | same |
| 5. Certificate of analysis is public A third-party certificate is reachable with no email gate and no account. | 0 ✗ | 0 ✗ | same |
| 6. Per-serving amounts are complete Serving size and servings per container are both on the panel. | 0 ✗ | 0 ✗ | same |
| Disclosure score | 3/6 | 2/6 |
The pair splits on 1 of the six criteria. The reasoning below is the same text that appears on each product page.
Nature's Bounty Probiotic Acidophilus: The single active carries an exact amount, Lactobacillus acidophilus La-14 0.5 mg (100 million CFU). No proprietary blend.
NOW Supplements Probiotic-10: 'Blend of 10 Strains of Probiotic Bacteria (25 Billion CFU)' is declared as a single 160 mg line with no per-strain amount or per-strain CFU split. A proprietary blend by the criterion's test, notwithstanding that every organism is named.
Both labels were scored the same way on the remaining 5.
Nature's Bounty Probiotic Acidophilus: No standardization-dependent ingredient in the formula.
NOW Supplements Probiotic-10: 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.
Nature's Bounty Probiotic Acidophilus: Strain designation La-14 is printed, not the species alone.
NOW Supplements Probiotic-10: All ten organisms carry strain designations, La-14, Bl-04, Lp-115, Lc-11, Lr-32, Lpc-37, Bb-18, St-21, Ls-33 and Bl-05. Third product in the sample to take this point.
Nature's Bounty Probiotic Acidophilus: Under methodology v1.11: every active in this product is a probiotic, so nothing on the panel can be checked against a trial range. The probiotic exclusion removes the comparison, it does not award the point.
NOW Supplements Probiotic-10: This product satisfies the v1.13 disclosure requirement and still fails on a separate ground. The label states 'This product is formulated to deliver a potency of 25 billion CFU through the Best By date', the first through-expiry guarantee found in the sample, so the delivered dose IS establishable. But the 25 billion is an aggregate across ten strains with no split, and the attribution rule bars a blend total from setting or satisfying a range for any single component. No strain can be compared to its own trial dose. The failure is a disclosure gap on the label, not a units problem in the literature.
Nature's Bounty Probiotic Acidophilus: No publicly accessible third-party certificate of analysis located 2026-09-26 (product page images, brand and parent-company pages, open web search); recorded as a negative finding, not a claim that none exists.
NOW Supplements Probiotic-10: No publicly accessible third-party certificate of analysis located for this product on 2026-09-27. NOW does operate a public lot-number certificate portal at cofa.nowfoods.com with no email gate or account, which would satisfy the criterion, but it is scoped to NOW's essential oils and does not cover supplements; the sample lot record checked was Peppermint Oil. Listing image 6 presents Intertek GMP certification, which the methodology excludes explicitly as a facility certificate rather than a product one. Recorded as a negative finding, not a claim that none exists.
Nature's Bounty Probiotic Acidophilus: Serving size '1 Tablet' is stated but servings per container is absent from the Supplement Facts panel.
NOW Supplements Probiotic-10: Serving size 1 Veg Capsule is stated but servings per container is absent from the Supplement Facts panel, the same failure as Seed DS-01, Culturelle and Nature's Bounty.