New Zealand produces between 15,000 and 20,000 tonnes of honey each year, with Manuka honey commanding premium prices in more than 40 export markets. Yet without a robust way to prove a jar labelled “Manuka” actually came from the mānuka plant (Leptospermum scoparium), the entire industry — and the medical grade products that depend on it — would be vulnerable to fraud and dilution.
That is why the Ministry for Primary Industries (MPI) developed and enforces a legally binding, science-based definition. Introduced in 2017 after a three-year research programme, it remains one of the most rigorous honey authentication frameworks in the world.
Why MPI created a science definition
Before 2017, there was no government-standardised way to verify that honey labelled “Manuka” was genuinely derived from mānuka nectar. Consumer trust and export premiums depended on private certification marks — mainly UMF — which test for antibacterial potency but do not confirm floral origin.
MPI's programme collected and analysed over 800 honey samples from more than 20 different New Zealand honey types across seven production years, alongside over 700 plant samples from two flowering seasons. Using advanced statistical modelling reviewed by three international experts, the programme identified unique chemical and DNA markers that could distinguish mānuka honey from every other New Zealand honey type.
The result was a five-attribute test (four chemicals from nectar plus one DNA marker from pollen) that separates authentic New Zealand mānuka honey from impostors and grades it as either monofloral or multifloral.
The five-attribute MPI test
Every batch of honey labelled as mānuka for export must be tested by an MPI-recognised laboratory. The definition uses two laboratory tests — one chemical, one DNA — to check for five specific markers.
Test 1: Chemical markers (LC-MS/MS)
Liquid chromatography tandem mass spectrometry (LC-MS/MS) tests for four compounds that originate in mānuka nectar:
- 3-phenyllactic acid — the primary discriminator between monofloral and multifloral grades
- 2′-methoxyacetophenone — a secondary chemical marker confirming mānuka origin
- 2-methoxybenzoic acid — supports authentication at both grade levels
- 4-hydroxyphenyllactic acid — supports authentication at both grade levels
Test 2: DNA marker (qPCR)
A multiplex quantitative PCR test detects DNA from Leptospermum scoparium pollen in the honey. The threshold is a Cq value of less than 36, which equates to approximately 3 femtograms of DNA per microlitre — an extremely sensitive detection limit that ensures even lightly filtered or blended honey cannot falsely pass if it lacks genuine mānuka pollen.
Monofloral vs multifloral thresholds
The same five markers are tested for both categories, but the chemical thresholds differ:
| Marker | Monofloral | Multifloral |
|---|---|---|
| 3-phenyllactic acid | ≥ 400 mg/kg | ≥ 20 and < 400 mg/kg |
| 2′-methoxyacetophenone | ≥ 5 mg/kg | ≥ 1 mg/kg |
| 2-methoxybenzoic acid | ≥ 1 mg/kg | ≥ 1 mg/kg |
| 4-hydroxyphenyllactic acid | ≥ 1 mg/kg | ≥ 1 mg/kg |
| Mānuka DNA (Cq) | < 36 | < 36 |
If honey fails any one of the five attributes for its claimed grade, it cannot legally be exported as mānuka honey from New Zealand. It may still be sold as a blended or non-mānuka honey, but not under the premium Manuka label.
The 2023 scientific review
In 2020, MPI began a scheduled review of the definition to ensure it remained robust against evolving fraud techniques and new scientific evidence. The review engaged domestic and international mānuka honey experts, analysed industry data, and subjected the original criteria to peer review.
In June 2023, New Zealand Food Safety announced the conclusion: the existing definition did not need to change. The 2018 criteria were confirmed as still fit for purpose — a strong endorsement of the original science programme.
How MPI standards connect to medical grade honey
MPI's framework operates at the source of the supply chain — the raw honey. Medical grade Manuka products such as Activon and Medihoney depend on this authenticated supply chain for credibility.
Here is how the two quality systems layer together:
- MPI authentication — confirms the honey is genuinely from the mānuka plant and distinguishes monofloral from multifloral.
- MGO / UMF potency grading — measures methylglyoxal (MGO) content and non-peroxide antibacterial activity, typically done by the producer or certifier.
- Medical device manufacture — the authenticated honey is gamma-irradiated to eliminate Clostridium botulinum spores and other microbes, manufactured under ISO 13485, and CE/UKCA-marked for use on broken skin.
Without step 1, steps 2 and 3 would be built on uncertain foundations. MPI's definition is therefore not just a trade rule — it is a patient safety safeguard for anyone using Manuka-based medical honey dressings or burn treatments.
Export rules and traceability
Beyond the science definition, MPI also enforces general export requirements for bee products that improve supply chain traceability. Exporters must:
- Keep detailed records of honey batches, testing results and destinations.
- Report non-conformances to MPI — for example, if products are refused entry by an importing country.
- Ensure products meet both New Zealand standards and the destination country's legislation.
New Zealand's honey export earnings exceed $340 million annually. MPI's combined framework of scientific authentication, recognised laboratory testing and export traceability is designed to protect that premium by ensuring every jar and every bulk shipment is what it claims to be.
What MPI rules mean for consumers and clinicians
If you are buying Manuka honey for personal use or recommending it to patients, MPI's framework gives you two practical checkpoints:
- For food jars — look for an MGO or UMF rating from a reputable New Zealand brand. While MPI does not regulate domestic labelling as strictly as export labelling, authentic producers will have MPI-compliant test certificates for their exported batches.
- For wound care or burns — only use products that carry a CE or UKCA mark, a lot number, and the word “sterile” on the packaging. These are medical devices, not food, and their quality assurance goes well beyond MPI's raw-honey definition to include sterility, biocompatibility and clinical validation.
Learn more about what separates food-grade from medical-grade in our Manuka vs medical grade honey guide.
Frequently asked questions
What does MPI stand for in relation to Manuka honey?
MPI is New Zealand's Ministry for Primary Industries. Since 2017, MPI has enforced a legally binding scientific definition that any honey labelled as 'Manuka' for export must pass a laboratory test of 4 chemical markers and 1 DNA marker from the mānuka plant (Leptospermum scoparium).
What is the MPI science definition for Manuka honey?
The MPI definition requires 5 attributes: four chemical compounds from nectar (3-phenyllactic acid, 2'-methoxyacetophenone, 2-methoxybenzoic acid, 4-hydroxyphenyllactic acid) at specific minimum levels, plus DNA from mānuka pollen below a threshold of Cq 36 (≈3 fg/µL). The exact thresholds differ for monofloral vs multifloral classification.
What is the difference between monofloral and multifloral Manuka honey under MPI rules?
Monofloral mānuka honey must have ≥400 mg/kg of 3-phenyllactic acid and ≥5 mg/kg of 2'-methoxyacetophenone (along with the other markers). Multifloral mānuka honey requires the same four chemicals and DNA but at lower thresholds: 3-phenyllactic acid between 20–400 mg/kg and 2'-methoxyacetophenone ≥1 mg/kg. Honey failing either test cannot legally be exported as mānuka.
Does MPI test every jar of Manuka honey?
No — MPI does not test every jar. Instead, the law requires that all honey labelled as mānuka for export be tested by an MPI-recognised independent laboratory. Exporters must keep records and report non-conformances. MPI operates a public register of recognised labs and conducts audits and market surveillance.
How does MPI's work relate to medical grade honey?
MPI ensures the starting material — authentic New Zealand mānuka honey — is genuine before it ever reaches a medical device manufacturer. Medical grade Manuka products such as Activon and Medihoney are built on this authenticated supply chain, then further processed (sterilised, tested, ISO 13485 certified) for use on wounds and burns.
Did MPI change the Manuka honey definition in 2023?
No. In June 2023, New Zealand Food Safety (part of MPI) published a thorough scientific review of the definition that concluded the existing 2018 criteria remained robust and fit for purpose. No changes were made.
Related reading
- Manuka vs medical grade honey
- Manuka antimicrobial properties
- Medical grade honey for burns
- How to use a medical honey dressing
- What makes a honey “medical grade”
- Research & evidence