"N Times Better Absorption" and "Stronger Than Others": A 2026 Guide to Checking Comparison Claims
JRQ consumer verification guide Published: November 6, 2026
Readers often ask: "Which is better, US NMN or Japanese NMN?" "Which is better, liposomal NMN or regular NMN?" "Which Japanese NMN brand gives the best value?" You also see claims online like "absorption is N times that of ordinary products" or "stronger than similar products." JRQ does not compare products or list brand recommendations. This guide covers one thing: when you see comparison claims like these, what information you should ask the seller for, and how you can check it yourself.
Start with the comparison target: what is being compared and how it was chosen
For a comparison claim to hold up, the first step is to say clearly which products are being compared. The brand, product name, batch, and specifications all need to be checkable. If the claim only says "a certain brand," "similar products," or "ordinary NMN," you cannot verify it.
The way the comparison products were chosen also needs to be explained. The seller cannot pick only comparison products that favor its own product, or compare things that are not in the same category. If the selection criteria are not stated, the stated multiple, effect, or value for money cannot be relied on. When the comparison product is anonymous, you cannot check its label or test report, and you cannot know whether it has the same specifications or the same daily dose. There is then no checkable basis for the comparison.
These requirements are covered by JRQ-D-013 Comparison Labeling Standard. That standard covers how comparison products are selected, the documentation required, alignment of indicators, and the scope of conclusions.
When you see "N times," ask four things
When you see "absorption is N times that of ordinary products," first ask what is being measured. Is it absorption, bioavailability, blood concentration, or some indicator in a cell study? Different indicators give completely different meanings to the multiple. If the claim only says "absorption" without defining it, it cannot be checked.
Second, ask which study it comes from. You need to see the original paper or research record. In vitro cell studies, animal studies, and human studies are not on the same level. Within human studies, randomized controlled trials are also different from observational studies. Preprints have not passed peer review, so they cannot be treated as confirmed findings. Clinical trials can be checked on public registration platforms, such as jRCT and UMIN-CTR in Japan, ChiCTR in China, and ClinicalTrials.gov in the United States. The paper's conflict-of-interest statement and funding source should be visible.
Third, ask whether the result is from humans. Results from cell and animal studies cannot be stated directly as human multiples. Ask whether there is a human study, and whether the sample size, study population, control design, and blinding are clearly described.
Fourth, ask whether the studied material is the product itself. Did the study use the exact product being sold, or only the same ingredient? Are the dose and form the same as what you would take daily? If the study used a high dose of the ingredient but the product's daily serving contains only a small amount, the multiple cannot simply be carried over.
For price comparisons, calculate the daily cost
When readers compare value for money, the common approach is to look at the price per bottle. That is not accurate. You need to calculate the total amount of NMN in the bottle as "milligrams of NMN per daily serving × number of days supplied," then divide the selling price by that total to get the price per milligram. Comparing products by price per milligram is what makes the comparison meaningful.
This is the purpose of JRQ-D-012 Daily Cost Labeling Standard. A bottle may be cheap, but if the amount per serving is low or the number of capsules is small, it can end up being more expensive per milligram. Some products recommend several capsules per day; calculating only "per capsule" would be misleading, so you need to look at the daily serving.
When a price seems unusually low, first check the actual amount per capsule, the test report batch, and the sales channel. Do not jump to the conclusion that it is a good deal.
Data must be from the same conditions, and indicators must be aligned
The documents for both sides of a comparison must be from the same conditions: the same substance, NMN compared with NMN, not NMN mixed with NR or NMNH; the same unit, milligrams against milligrams; and the same daily serving. If the indicators are not aligned, the comparison result is meaningless.
The conclusion must not go beyond what was compared. If the claim only compared a single in vitro indicator, it cannot turn that into a conclusion like "better overall" or "more suitable." The test report batch must correspond to the product batch. Data cited in a comparison should come from a checkable analysis report, not from a promotional image.
For products from different countries, you cannot simply say "Made in Japan" or "Made in the US" means better. In Japan, except for Foods for Specified Health Uses (FOSHU), foods are not individually approved before marketing. In the US, dietary supplements are regulated by the FDA but do not receive pre-market approval. What matters is whether the label and documents can be checked, not the country of origin.
If a claim cites the notification content of a Japanese Food with Function Claims (FFC), you should be able to look up the notification number. Health food in mainland China should have the "blue hat" health food logo and an approval certificate that can be checked. Ordinary foods are not allowed to claim health functions.
Verification checklist
| Item to check | Where to look | What adequate information looks like | Warning signs |
|---|---|---|---|
| Comparison target | product page, original research document | brand, product name, batch, and specifications are clearly stated | only says "a certain brand" or "similar products" |
| Indicator behind the multiple | original study cited | indicator is clearly defined and units are clear | only says "absorption" or "effect" with no definition |
| Study level | original paper, trial registration platform | clearly states human or animal; sample size, control, and blinding are checkable | presents cell or animal results as if they were human experience |
| Whether the tested material is the product itself | study subject and product label | clearly states the ingredient or product batch used in the study corresponds to the commercial product | study used ingredient A, but the product being sold is B |
| Comparison conditions | original documents for both sides | same substance, same unit, daily serving aligned | mixes NMN with NMNH, or does not distinguish milligrams from micrograms |
| Price | label, package, store page | can be converted into price per milligram or daily cost | gives only bottle price or strikethrough price without amount per serving |
| Scope of conclusion | advertising language and original data | conclusion does not go beyond what was compared | draws "better" or "more effective" from a single indicator |
| Certification/accreditation mark | issuing organization's official website | the certified object, number, and scope can be checked | logo is blurry or the organization's name is not given |
Common misconceptions
- "Made in Japan is better" or "Made in the US is better." Origin alone does not show quality. What can be checked are labels, test reports, and research documents.
- "Absorption is N times that of ordinary products" means the product is better. The multiple only describes the indicator used in the claim and the result of that particular study. It does not mean the product is better overall, and it does not mean it is right for you.
- A comparison against "a certain brand" is the most convincing. An anonymous comparison product cannot be checked, so it is actually a reason for caution.
- "A cheap bottle means good value." You need to convert the price into cost per milligram per day, not just look at the bottle price.
- "Having a clinical study is proof." Check whether it involved humans, whether the studied material was the product itself, and whether the conclusion goes beyond what was compared. Preprints and conference posters have not passed peer review.
Related JRQ standards
- JRQ-D-013 Comparison Labeling Standard: sets requirements for the selection range, documentation conditions, indicator alignment, and scope of conclusions in comparison labeling. The verification method in this guide is based on this standard.
- JRQ-D-006 Research Citation Labeling Standard: cited research must be traceable to the original material, so readers can check whether the experiment used the product itself and whether it was in humans or animals.
- JRQ-D-012 Daily Cost Labeling Standard: price comparisons must be converted into cost per milligram based on the daily serving; comparing only the bottle price is not enough.
Scope of this guide
This guide only explains how to verify information in comparison claims. It does not evaluate the efficacy of any ingredient, does not compare products, and does not recommend or certify any specific product.
It does not directly answer questions such as "Which is better, US NMN or Japanese NMN?" or "Which is better, liposomal NMN or regular NMN?" It only tells you how to examine the information behind those claims.
If you are taking medication, have a chronic illness, or are pregnant or breastfeeding, consult a doctor or pharmacist before purchase.
Other guides: Reading "research shows" claims · Checking safety information · Checking label dosage information · Ingredient identity and isomers · New ingredients: status and labeling · Checking combination formulas · Checking certification claims · Checking overseas raw material claims · Checking regenerative medicine providers in Japan · Checking "stem cell" products · Storage and stability · Reading "not detected" · Lot numbers and authenticity · Production methods and impurities · Checking glutathione labels · Checking 5-ALA labels · Reading advertising terms · Questions to ask sellers · Checking cell storage services · Checking PQQ labels · Phosphatidylserine labels · Alpha-lipoic acid labels · Checking ergothioneine labels · Checking plasmalogen labels · Checking quercetin labels · Checking creatine labels · Checking sesamin labels · Berberine labeling and status