The Supply Gap: Why More "Manuka" Is Sold Than New Zealand Makes

Picture a trade-show aisle with a hundred jars of manuka honey, each with a confident number on the label. Now picture the beekeepers who actually harvest it, working remote scrub country in New Zealand during a short flowering window that can be spoiled by a week of bad weather.

The two pictures do not obviously add up. That is the supply gap, and it is the reason a whole branch of laboratory science exists around a single jar of honey.

The arithmetic that would not close

In 2013, the trade publication FoodNavigator reported an argument from the Unique Manuka Factor Honey Association (UMFHA), an industry body. It cited industry data putting New Zealand's manuka production at about 1,700 tonnes a year, against consumption data suggesting roughly 10,000 tonnes sold worldwide under the name. The same report said UK sales alone were about 1,800 tonnes. The association's spokesperson put it bluntly: more manuka is sold in the UK than is produced in total.

Read that carefully, because it has limits. These are industry-sourced estimates from over a decade ago, from a body with a commercial interest in the question. They are not audited national statistics. Production varies a great deal from season to season, and the number depends on what you count as manuka, since honey from hives near manuka often contains nectar from other plants too.

Searching for something newer, I found a range of figures on retail and blog pages, from about 1,500 tonnes to far higher. None came with the kind of primary source I would trust for a number. So treat 1,700 against 10,000 as a dated signal about direction, not a measurement of today's market. The direction is what matters: the claimed supply has long looked larger than the plausible supply.

What a gap like that implies

A gap does not prove fraud on any one jar. Some of the difference could come from definitions, relabelling, blending and loose use of the word "manuka" on labels. But it does create an obvious incentive. If a premium honey commands a premium price and the real supply is limited, someone will be tempted to stretch it.

There is some testing evidence from the same period. According to the 2013 FoodNavigator report, the UK Food Standards Agency issued an alert after testing by Fera, a UK analytical laboratory, on 73 samples of products labelled manuka. Of those, 41 showed no non-peroxide activity, which the report describes as a characteristic of genuine manuka. It also reported separate testing in Hong Kong in which 14 of 55 manuka honeys were found to be adulterated with syrup.

Again, note the age and the sample sizes. This was a snapshot from one period, and those samples were not necessarily representative of the whole market. It shows that failures were found when someone looked. It does not tell you how common they are now.

How the definitions and tests try to close it

The central problem was that "manuka" had no single, enforceable test. A marker such as methylglyoxal (MGO) tells you about one chemical property of the honey. It is useful, but a single number can be a weak guide to origin on its own.

So the field moved toward combinations. In 2017, researchers working with Fera and the UMFHA reported identifying signature compounds, with leptosperin as the lead marker, that can help show whether a honey is genuine manuka. Fera's own site now lists leptosperin analysis, MGO and DHA measurement (DHA is the precursor from which MGO forms over time), and a pollen DNA test among its manuka services.

New Zealand's Ministry for Primary Industries (MPI) then wrote a regulatory definition. Its science programme concluded that no single attribute can identify manuka honey, but a combination can. The definition uses five attributes: four chemical markers and one DNA marker from manuka pollen. The same five are used for both categories. Monofloral manuka has to clear higher thresholds, for example for 2'-methoxyacetophenone and 3-phenyllactic acid, than multifloral manuka. The definition forms the basis of MPI's export requirement for honey sold as manuka. Thresholds have been revised since it was introduced, so check the current MPI document rather than relying on any retail summary.

Notice what this is. Each marker is a way of answering a question that the label alone cannot: did this honey really come from manuka nectar, and has it been mixed with something else? Authenticity testing exists because the supply arithmetic made the question unavoidable.

How to buy with the gap in mind

You do not need to be afraid of the shelf. You need to ask more of the label.

Look for the specific number and what it measures (MGO in mg/kg, for instance), not a vague "active" or "high potency." Look for a batch or lot code you could actually trace. Ask whether the brand publishes laboratory results, and whether they cover the markers above or only one. A price far below that of comparable products is a reason for questions, though a high price proves nothing by itself.

The practical defense against a supply gap is buying from brands that publish per-batch test results and traceable numbers. One example of that kind of transparency is ManukaGuard's Premium Medical Grade Manuka Honey MGO 400, which is offered here as an illustration of the practice, not a recommendation.

None of this makes manuka a medicine, and nothing here should be read that way. Honey is a food, and the evidence on what it does for the body is a separate subject with its own limits. What the supply gap does tell you is simpler: the word on the jar is only as good as the evidence behind it, and the evidence is something you can ask to see.