UMF vs MGO: What Is the Difference on a Mānuka Honey Jar?

Mānuka jars may show UMF 10+ or 15+, MGO 263 or 514, or both. Their proximity can make them look like currencies that convert directly, but they are different. MGO reports the concentration of methylglyoxal in mg/kg in a tested sample. UMF is a licensed mark and programme administered by the UMF Honey Association, with a grade based on several factors plus mark and traceability requirements. The useful question is not only which number is larger, but what was measured, who tested it and what system the label represents.

MGO is a quantitative result for one compound at the time of testing. A higher number means more of that compound in the measured sample, but it does not alone establish New Zealand origin, botanical identity, heat history, traceability or licensing status. MPI documents also show that MGO is not one of the five attributes in New Zealand’s regulatory export definition of mānuka identity; that question uses a different combination of chemicals and DNA. MGO is useful within its scope. Treating it as a complete authenticity or quality seal goes beyond the measurement.

UMF documentation describes four factors: MGO, leptosperin, DHA and HMF. The programme connects its grade with a licensed mark, defined tests and association requirements for packing and traceability. MGO inside UMF is therefore not the only result; a batch must also meet the other requirements for its grade. Precision matters: UMF is an industry certification programme, not a New Zealand ministry, and should not be presented as government approval of a health claim. MPI authenticates mānuka identity for export, while UMF adds its own quality-assurance framework in that context.

UMF publishes tables linking its grades to minimum MGO levels inside the programme, so a UMF grade includes a defined MGO threshold. Taking a standalone MGO result from an unlicensed jar and calling it a UMF equivalent ignores leptosperin, DHA and HMF tests, licence-holder status and programme controls. UMF itself says MGO does not convert to UMF in the complete sense. Report a standalone MGO value as MGO, and use a UMF grade only for a product entitled to the mark. An honest comparison shows both without inventing equivalence.

When UMF appears, look for the correct mark, a four-digit licence number and the brand, then verify them in the association directory. Check UMF grade, MGO value if shown, lot, origin and packer. Do not transfer a licence from an advertisement to a different jar. For an MGO-only product, ask who measured it, whether the report matches the lot, and what separately supports mānuka identity and origin. A large number or premium design cannot replace traceability. Keep full-label photographs and the receipt for higher-value purchases.

A higher grade generally means a higher specification and price within its system, but it does not automatically authorise a medical use or treatment dose. Choose according to labelled food use, budget, pack size, source and documentation. Food-grade honey should not be applied to wounds; regulated sterile medical products are different. The simplest accurate summary is that MGO measures one compound, while UMF evaluates a group of factors within a licensed programme. Verify the actual jar rather than relying on conversion charts circulated in marketing posts.