A certificate of analysis, usually shortened to COA, is the laboratory document that says what is actually inside an NMN capsule. If a brand cannot show you a recent one from an independent laboratory, you have no evidence that the powder you are buying is nicotinamide mononucleotide at the purity printed on the label. This is how to read one, and the five checks worth doing before you order.
What a certificate of analysis actually is
A certificate of analysis is a report issued by a laboratory against a single production batch. For an NMN supplement it should do three things: confirm the identity of the compound as beta-nicotinamide mononucleotide, state the measured purity as a percentage, and report screening for contaminants such as heavy metals and microbial growth.
The key word is batch. A COA is not a general statement about a product. It applies to one run of material with one batch number, made on one date. This is why a certificate from two years ago tells you very little about the bottle currently on the shelf.
The five checks
- Who issued it. The laboratory named at the top should be independent of the brand and of the raw material supplier. A report on the supplier's own letterhead is a supplier datasheet, not third-party verification.
- Which batch, and when. Look for a batch or lot number and a test date. Both should be present, and the date should be recent enough to plausibly cover the stock being sold.
- What was measured. The certificate should name the analytical method, commonly HPLC, and report purity against beta-NMN specifically rather than against a general nicotinamide assay.
- Contaminant screening. Heavy metals (lead, arsenic, cadmium, mercury) and microbiological limits should appear with actual measured values, not just a pass or fail stamp.
- Whether it matches the label. Compare the certificate against the bottle. If the label claims 500mg of NMN per capsule at 99% purity, the certificate should support both halves of that claim.
What a strong certificate shows, and what a weak one shows
| Element | Strong certificate | Weak or evasive |
|---|---|---|
| Issuing lab | Named independent laboratory, contactable | Unnamed lab, or the supplier's own paperwork |
| Batch reference | Specific batch or lot number | No batch number, or "representative sample" |
| Date | Dated, and recent relative to stock | Undated, or years old |
| Compound tested | Beta-NMN identified explicitly | "NMN" or "nicotinamide" without isomer detail |
| Purity | Measured value, method stated | Claim repeated with no measurement |
| Contaminants | Measured values against stated limits | Omitted entirely, or a bare "pass" |
What 99% purity actually means
Purity figures for NMN describe how much of the powder is beta-nicotinamide mononucleotide rather than something else. Most established UK brands report somewhere between 98% and 99.9%. The difference between 98% and 99.5% is real but small, and in practice it is not the number that separates a good product from a poor one.
What separates them is whether the number is measured or asserted. A stated 99% with nothing behind it is worth less than a measured 98.5% on a dated, batch-specific certificate from a laboratory you can look up. Treat the percentage as the least interesting line on the page and the provenance of the document as the most interesting.
Beware one specific substitution. Nicotinamide is a cheaper, related compound, and independent testing of the NMN market has repeatedly found products containing significantly less NMN than claimed, sometimes with nicotinamide making up the difference. A certificate that names beta-NMN explicitly, and reports it by a method capable of distinguishing the two, is the defence against this.
Why this matters more for NMN than for most supplements
NMN is expensive to manufacture and difficult for a buyer to assess by inspection. The capsules all look the same. There is no taste test, no visible difference between a well-made batch and a poor one, and no immediate effect that would tell you within a week whether you received what you paid for. In a category like that, documentation is the only practical consumer protection.
The molecule is also sensitive to heat and humidity, which means storage and shipping conditions matter alongside the original assay. A certificate confirms what left the laboratory. Opaque, sealed packaging with a desiccant is what protects it on the way to you.
Where RGENR8 stands
RGENR8 Pure NMN is a single-ingredient capsule containing 500mg of beta-nicotinamide mononucleotide, encapsulated and quality-checked to GMP-equivalent standards. Every batch is independently third-party tested, and it is at least 99% pure.
There is nothing else in the capsule: no magnesium stearate, no silicon dioxide, no fillers or flow agents, just NMN in a vegan HPMC shell. The 3-month plan is £27.99 for 90 capsules on your first order with code WELCOME20 (31p a day, £0.62 a gram), with free UK delivery, and you can cancel or switch plans online whenever you like. See the plan.
Common questions
What is a certificate of analysis for an NMN supplement?
A laboratory report stating what a specific batch actually contains. For NMN it should confirm the compound as beta-nicotinamide mononucleotide, state measured purity as a percentage, and report screening for heavy metals and microbial contamination. It is issued against a batch number, not against the product in general.
What purity should I look for in an NMN supplement?
Look for measured purity of 98% or higher for beta-NMN, with 99% and above common among established UK brands. The figure matters less than the evidence behind it. A stated 99% with no supporting report is worth less than a measured 98.5% on a dated, batch-specific certificate from an independent lab.
Is "third-party tested" the same as "lab tested"?
No. "Lab tested" can mean the manufacturer tested its own material in its own facility. "Third-party tested" means an independent laboratory with no commercial interest in the result performed the analysis. Only the second gives you an outside check on the brand's own claims.
Should the certificate be batch specific?
Yes. A COA applies to one production batch. Check that the batch number and date correspond to current stock, and treat an undated or batch-less document as marketing rather than evidence.
Can I ask a UK brand for a certificate before buying?
Yes, and it is a reasonable request. Established UK brands either publish certificates on the product page or supply them by email on request. A brand that declines, delays, or sends a supplier datasheet instead of an independent laboratory report has answered the question in a different way.
Is NMN legal to buy in the UK?
NMN is not banned, not a controlled substance and not prescription-only, and it is openly sold by established British brands. It also holds no novel food authorisation in Great Britain, meaning it has not completed the safety assessment required before an ingredient is formally authorised as a food supplement. Both are true at once: the full position is explained here.
If you are pregnant, breastfeeding, taking medication or managing a health condition, check with your GP before starting any new supplement.
