Enzymatic, Fermentation or Chemical Synthesis: How Is NMN Made? A 2026 Guide to Production Methods and Impurity Information
JRQ consumer verification guide Published: November 6, 2026
Consumers often ask whether the enzymatic method or chemical synthesis is better for NMN, and how NMN is actually made. JRQ does not judge which production method is better, and does not recommend any product. This guide only explains how to check the method name, purity, and impurity information so you can avoid being led by advertising language. The basic approach is: the method name refers to the raw material; for reports, look at the method, lot number, and sample type.
1. The method refers to the raw material, not the finished product; different methods require corresponding impurity checks
Keep one thing in mind: the method name refers to the raw material, not the finished product. Different production methods require different impurity tests. Common production methods for NMN raw material include the enzymatic method, fermentation, and chemical synthesis. These names usually describe the raw material supplier's process, not the finished product. The finished product also goes through formulation, mixing, filling, and other steps, so a product page that says "enzymatic NMN" should not be taken to mean that the finished product was made by the enzymatic method. For example, if it says "fermented NMN," it should make clear that fermentation refers to the raw material production step, not that the whole capsule is called a fermentation product.
When a product page states a production method, check three things: whether it clearly says this is the raw material process; whether it can be linked to a specific lot number; and whether it lists impurity tests appropriate to that process. If any one of these three is unclear, do not rush to conclude that the method is good. JRQ does not judge which production method is better.
Different production methods can leave different process-related impurities, so the test items should match the method used (JRQ-Q-002). Do not look only at a single purity number. In addition to purity, raw material testing may include related substances (impurities), heavy metals, and microbial tests. Which impurities a given method tends to leave behind is something the supplier and the testing organization need to make clear; what consumers can do is check whether the report lists those items.
2. "Method X is purer" claims need purity and impurity reports
If an ad says "method X is purer," you cannot conclude that from the method name alone. Purity is usually measured by methods such as high-performance liquid chromatography (HPLC). The test report should state the test method, whether the sample is raw material or finished product, and the lot number (JRQ-D-005). High raw material purity does not mean each capsule of the finished product contains a high amount of NMN; for the finished product, you also need to check how many milligrams each capsule or daily serving contains. If a report tested only the raw material and is used to prove the finished product content, that is incorrect.
"Not detected" in a report means below the limit of detection (LOD) for that method; it does not mean the content is zero. "Below the limit of quantification (LOQ)" means the substance may be detected but no reliable number can be given (JRQ-D-016). When reading a report, check whether the test method and the LOD or LOQ values are stated. If a report only has the words "not detected" with no method and no LOD value, there is no way to verify it.
It is reasonable to ask the seller for documentation. You can ask for the ingredient specification, the content per daily serving, the test report matching the lot number, manufacturer information, and the basis for storage conditions. The lot number should be clear and readable, and should match the outer carton and bottle label; when documents are updated, the update date should be visible. The sample type must also be stated: whether the test was done on raw material or finished product.
Verification checklist
| Item to check | Where to look | What adequate information looks like | Warning signs |
|---|---|---|---|
| Production method (enzymatic, fermentation, chemical synthesis) | Product page, label, raw material specification sheet | States it is the raw material process and can be linked to a specific lot number | Only vague wording such as "advanced process" without saying which stage |
| Purity value | Test report | States test method (e.g., HPLC), sample type (raw material/finished product), lot number | Only gives a percentage, without sample or method |
| Impurity / related substance items | Test report | Lists impurity items corresponding to that production method and gives results | Vague "impurities passed" with no specific items |
| Limit of detection / limit of quantification | Test report | "Not detected" or "below LOQ" is accompanied by the method's LOD value | Report only says "not detected" with no method information |
| Lot number match | Bottle label, outer carton, report | All three match, and the same batch production records can be traced | Lot number is unclear or report batch does not match |
| Finished product content | Finished product test report | States how many milligrams per capsule or per daily serving, and the sample is the finished product | Only raw material purity is stated, used in place of finished product content |
| Manufacturer information | Label or product page | Has manufacturer/importer name and can be traced | Only says "Japanese raw material" or "imported from overseas" with no specific company |
| Report version and update | Product page or customer service reply | Documents have version number and update date, and old versions can be checked | Verbal assurance, no documents |
Common misconceptions
- Myth 1: The more "advanced" the method name sounds, the better the product. Explanation: Different methods do not mean better or worse. The key is whether the impurity tests appropriate to that method have been done. Enzymatic, fermentation, and chemical synthesis each have their own impurity risks.
- Myth 2: "Very high purity" means high content per capsule. Explanation: Purity and content per capsule are two different things. Check the sample type in the report; high raw material purity does not mean high NMN content per capsule in the finished product.
- Myth 3: "Not detected" means completely absent. Explanation: "Not detected" only means below the method's limit of detection; it does not mean zero. A "not detected" result with no LOD value cannot be judged for reliability.
- Myth 4: Seeing "chemical synthesis" means it is unsafe. Explanation: JRQ does not judge whether one production method is safer than another. It only requires that tests match the production method. Safety depends on the specific test results.
- Myth 5: If the product page says "enzymatic," that is proof. Explanation: You need to see the process description or test report matched to a lot number. It is only meaningful if it can be traced; verbal promises do not count.
Related JRQ standards
- JRQ-Q-002 NMN Quality Standard: Used to check NMN chemical identity, isomers, process- and degradation-related impurities, stability, and consistency between testing and labeling.
- JRQ-D-005 Certificate of Analysis Disclosure Standard: Used to check whether a test report is for the right product, is authentic, is disclosed within the right scope, and matches the label; whether the report and product line up.
- JRQ-D-002 Purity Labeling Standard: Used to check whether "purity" refers to raw material or finished product, whether the test method is stated, and whether the number can be traced to a specific lot.
- JRQ-D-016 Labeling Standard for Limits of Quantification and Detection: Used to check whether "not detected" or "below LOQ" is accompanied by method information. Results without numerical values should not be treated as zero or as passing.
Scope of this guide
This guide only explains how to verify information. It does not evaluate the efficacy of any ingredient, and it does not recommend or certify any specific product. JRQ does not judge which production method is better or worse. If you are taking medication, have a chronic illness, or are pregnant or breastfeeding, consult a doctor or pharmacist before buying. For the specific safety of any product, rely on official acceptance records and actual test reports.
Other guides: Reading "research shows" claims · Checking safety information · Checking label dosage information · Ingredient identity and isomers · New ingredients: status and labeling · Checking comparison claims · 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 · 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