NAD+ supplement quality: how to read a COA

What the certificate should identify

Begin with the product name, ingredient identity, lot number and report date. A report for a raw material is different from a report for the finished capsule, powder or liquid. Ask which one the document covers. A manufacturer's general testing statement does not let you determine whether the product in your order is the one that was tested.

Look for the laboratory name, the methods used, the measured results and the acceptance criteria. A pass label without a method or a specification tells you little about what was actually checked. If a result uses unfamiliar units, ask the seller or laboratory to explain them. A clear answer should connect the report to the product rather than redirecting you to a benefit claim.

Identity, amount and contamination are separate

Identity testing asks whether the material is the intended ingredient. Potency or content testing asks how much of an ingredient is present under the stated method. Tests for contaminants address specified unwanted substances. A favorable result in one category does not automatically answer the others. The useful question is what this particular report measured and what it left outside its scope.

The NIH Office of Dietary Supplements explains that manufacturers are responsible for supplement quality and that independent organizations offer different kinds of quality assessment. Its consumer guidance also makes a crucial distinction: a quality seal does not guarantee safety or effectiveness. Verification can support a manufacturing claim without establishing a health outcome.

A purity percentage does not describe the whole purchase

A percentage displayed beside an ingredient can refer to a raw material assay rather than the amount in a finished serving. A blend may contain other ingredients and excipients, and a report may cover only one component. Ask how the tested specification relates to the finished label. Without that connection, a large purity figure can be more persuasive than informative.

For a product that claims enhanced absorption, a conventional content assay is not enough to establish that claim. The assay may address what is in the container; a human absorption claim needs evidence about what happens after use. Likewise, a document showing ingredient identity cannot establish a fatigue, memory or longevity benefit.

Why oral and injectable quality claims differ

Do not use a supplement-grade certificate to infer that a material is suitable for injection. FDA has specifically warned about food-grade NAD+ being used to compound sterile products without appropriate processing. Its concern includes microbial and endotoxin contamination. A product intended for swallowing and a sterile injectable product have different intended uses and quality questions.

If you are considering a prescribed compounded product, ask the clinician and dispensing pharmacy about the finished preparation and the controls relevant to it. A supplement seller's certificate does not answer those questions. Do not treat a research-use label or a laboratory reagent report as evidence that a product is appropriate for personal medical use.

Use quality evidence without confusing it with benefit evidence

A sensible comparison keeps two columns in mind: whether the product is what its label says, and whether relevant clinical research supports the benefit being sold. Good documentation in the first column is valuable. It does not fill an empty second column. This distinction helps you avoid both dismissing useful testing and overstating what that testing proves.

Keep a copy of the label, report and lot information if you discuss the product with a clinician or report a problem. For purchasing decisions, favor sellers who make their specifications understandable before checkout. A certificate that cannot be linked to the actual product is a reason to request clarification, rather than a reason to infer fraud or assume quality.

• Does the report match the product and current lot?
• Was the raw ingredient or finished product tested?
• Which methods, specifications and results are listed?
• Are quality claims kept separate from clinical benefit claims?

Sources and scope

These are selected studies and official sources relevant to the question above, rather than a systematic review of every published paper. A finding applies to the people, ingredient, route and outcomes studied. This guide provides education, not a diagnosis or medical advice. Discuss personal treatment decisions with a licensed clinician.

1. National Institutes of Health, Office of Dietary Supplements. Frequently Asked Questions: supplement quality. Accessed October 2026.
2. U.S. Food and Drug Administration. FDA reminds compounders to use ingredients suitable for sterile compounding. Accessed October 2026.

Continue reading

• NAD+ FDA and compounding questions

  FDA approval, compounded preparations and the sterile-ingredient warning, with questions for the prescriber and pharmacy.

• NR vs NMN vs NAD+

  The ingredient and route matter as much as the label. How human studies of precursors differ from studies of NAD+ itself.

• NAD+ biomarkers vs health benefits

  What a higher laboratory result can establish, and what still needs a meaningful clinical outcome.

All NAD+ research guides