What "Non-Detect" Actually Means on a Lab Report

"Non-detect" means a laboratory ran a specific test for a specific compound and the instrument response fell below that method's detection limit. It does not mean zero, and it says nothing whatsoever about compounds that were not on the panel. Which is why reading a certificate of analysis starts with the analyte list, not the results column — a page full of ND entries can still leave the question you actually care about completely unanswered.

Quick answer: what each term on a report means

The three numbers behind every "non-detect"

Analytical chemistry does not produce yes-or-no answers. It produces signals, and the question is always whether a given signal is distinguishable from background noise. Three thresholds govern that judgement.

Limit of detection (LOD) is the lowest concentration at which the method can tell "something is there" from "that is just noise." Below the LOD, the instrument genuinely cannot say. This is the line that produces an ND.

Limit of quantitation (LOQ) is higher — the lowest concentration at which the method can put a reliable number on the amount. Between the LOD and the LOQ, the laboratory knows something is present but cannot responsibly say how much. A well-written report will say "

Reporting limit (RL) is an administrative threshold: the lowest number the laboratory has agreed to put on a certificate for that method and matrix. It is usually at or above the LOQ. It exists because reporting numbers a method cannot defend causes more problems than it solves.

The consequence is straightforward and rarely stated: an ND is a statement about a method, not about a substance. Two laboratories can test the identical sample and one can report ND while the other reports a real number, without either being wrong — because they ran methods with different sensitivities. An ND from a method with an LOD of 1 part per million and an ND from a method with an LOD of 1,000 parts per million are not the same claim, and nothing on the face of a poorly written certificate tells you which one you are holding.

This is why the methods column and the limits column matter as much as the results. A report that lists results without limits has withheld the information needed to interpret it.

A worked example with real numbers

The DEA action published in the Federal Register on July 6, 2026 gives us concrete arithmetic to work with.

FR Doc 2026-13580 covers 7-hydroxymitragynine above a threshold: 0.050% w/w, or 1.00 mg per article. Convert that percentage into the units a laboratory actually reports:

• 0.050% w/w = 0.5 mg per gram = 500 parts per million (ppm)
• In a 2-gram sachet, 0.050% w/w works out to exactly 1.00 mg — the two limits coincide at that weight
• In a 5-gram serving, 0.050% w/w would be 2.5 mg, so the 1.00 mg per-article figure is the binding constraint

Now consider two laboratory methods.

Method A is an LC-MS/MS assay with an LOQ of 5 ppm. An ND from Method A means the analyte was below roughly one one-hundredth of the 500 ppm threshold. That ND is genuinely informative.

Method B is an HPLC-UV assay with a reporting limit of 0.1% — that is 1,000 ppm. An ND from Method B is fully compatible with the sample containing 900 ppm, nearly twice the regulatory threshold. Method B's ND is not a lie. It is simply an answer to a question far coarser than the one you were asking.

Both certificates print the same two letters. Only one of them addresses the threshold. If a report does not state its limits, you cannot tell Method A from Method B, and the ND is worth what you can verify about it — which is nothing. We walk through the threshold arithmetic in more detail in our breakdown of the 7-OH threshold.

There is a further wrinkle worth understanding. FR Doc 2026-13581 covers mitragynine pseudoindoxyl, MGM-15 and MGM-16 with no threshold at all — any detectable amount. When a rule is written that way, the method's detection limit effectively becomes the compliance line, because "detectable" is defined by whatever instrument is doing the detecting. A more sensitive method makes more material non-compliant. That is an unusual property for a legal standard and it makes method disclosure more important, not less.

Why the analyte list comes first

Everything above concerns compounds that were tested. The larger problem is the compounds that were not.

A certificate of analysis is not a statement about a product. It is a statement about a finite list of compounds that somebody chose, in advance, to measure. That list is a decision — made by the brand, the manufacturer, or occasionally the laboratory's standard package — and it is made before any sample is analysed.

Every compound outside that list is untested. Not absent. Not cleared. Not "presumably fine given the other results." Untested. There is no chemical relationship between a non-detect for one alkaloid and the concentration of a different one; molecules do not vouch for each other.

So the reading order is: analyte list, then methods and limits, then results. Most people read them in exactly the reverse order, see a column of NDs, and form a conclusion the document never supported. That inference gap is where nearly all of the misplaced confidence in this industry comes from, and it does not require anyone to lie. Every word on the page can be true and the reader can still walk away believing something false.

When you open a report, count the analytes before you read a single result. If the panel is six compounds long and the compound you are worried about is not among them, the results column is irrelevant to your question — however many NDs it contains. Our full guide to reading a certificate covers the header block and contaminant sections in the same way.

"Total alkaloids 0.00" is a different kind of statement

Some reports include a summary line such as Total Alkaloids. It looks like the most comprehensive number on the page, and it is usually the least.

A total is almost always the arithmetic sum of the individual analytes the method quantified — not a measurement of every alkaloid in the sample. If a panel measures seven compounds and all seven come back non-detect, the total is reported as 0.00 by construction. It carries no information beyond the seven results already printed above it, and it is not evidence about an eighth compound that was never on the list.

Read totals as summaries of the panel, never as summaries of the sample.

What our own reports say, and what they do not

We apply this to ourselves, in public, because a post like this is worthless from a company that will not.

The supplier certificates we hold for the cat's claw products we currently stock report non-detect for seven analytes: 7-hydroxymitragynine, mitragynine, speciociliatine, speciogynine, paynantheine, corynantheidine and mitraphylline. Both incumbent certificates also report Total Alkaloids at 0.00 — which, per the section above, is the sum of those seven results and nothing more.

Those panels do not test for mitragynine pseudoindoxyl, MGM-15, MGM-16, or corynoxine B. We therefore cannot tell you those compounds are absent, and we do not. No test was run, so no result exists, so no claim is available to us. Three of them — mitragynine pseudoindoxyl, MGM-15 and MGM-16 — are compounds named in the DEA scheduling action. They are not compounds our products were cleared of, and collapsing those two sentences into one is precisely the move this entire post exists to teach you to catch.

The certificates are posted on our COA page, and the same disclosure appears there. If you want the process behind it, how we decide which brands to carry sets out the gates a product passes before it reaches the catalogue.

Five questions to ask of any non-detect

1. Which analytes were on the panel? Read the list before the results. If your compound is not on it, stop — the report cannot answer your question.
2. What method was used? LC-MS/MS, GC-MS and HPLC-UV differ in sensitivity by orders of magnitude for the same analyte.
3. What are the LOD and LOQ for each analyte? An ND without limits is an uninterpretable result.
4. Is the limit below the threshold that matters? If the reporting limit sits above the regulatory threshold, an ND cannot demonstrate compliance with it.
5. Does the batch match your package? A perfectly sensitive method on a different lot tells you nothing about the item in your hand.

Frequently Asked Questions

Does non-detect mean zero?

No. It means below the method's limit of detection. The true value could be zero, or it could be a concentration too small for that method to see. Analytical chemistry cannot demonstrate the absolute absence of anything.

Is "

It is different, and more informative. "

If a report lists twenty analytes as ND, isn't the product clean?

It is evidence about twenty compounds. Whether that is reassuring depends entirely on whether the compound you care about is one of the twenty. A long list of the wrong analytes is not more informative than a short list of the right ones.

Why don't laboratories just test for everything?

Because "everything" is not a chemically meaningful target. Each analyte needs a validated method, a reference standard and instrument time. Panels are finite by necessity, which is exactly why the panel's contents must be published rather than summarised as "tested."

What should I do if a report has no limits column?

Ask the seller for the method and the LOD or LOQ per analyte. A brand with a real report from a real laboratory can produce that in a day. If the answer is a restatement of "we're third-party tested," you have learned something useful about the seller rather than the product.

These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. For adults 21+. Legality depends on the specific formulation and applicable state law — check the rules where you live. Nothing here is legal advice.