Leptosperin confirms genuine Manuka origin, tested alongside MGO under UMF certification. DHA is the precursor that converts into MGO as honey matures. HMF is the one certificate number where lower is better, since it signals heat or age exposure rather than potency.
Leptosperin: The Origin-Proof Marker
Leptosperin is what UMF testing checks alongside MGO to confirm the honey actually came from Manuka nectar, not just that it has antibacterial activity. That distinction matters because MGO alone doesn’t prove origin. Synthetic methylglyoxal exists and has been used in real cases of honey fraud to fake a high MGO reading on non-Manuka honey.
Leptosperin doesn’t have that problem. It isn’t commercially available to buy or produce at any viable cost, so there’s no economical way to fake it the way MGO can be faked. That’s exactly why it’s built into New Zealand’s Ministry for Primary Industries (MPI) scientific definition of genuine Manuka honey as one of the required authentication markers, not just a UMFHA add-on.
DHA: The Compound That Becomes MGO
DHA (dihydroxyacetone) is present in fresh Manuka nectar and converts into methylglyoxal naturally as honey matures in storage. It’s the reason MGO isn’t a fixed number the moment a jar is bottled, it keeps developing for a while afterward.
This has a genuinely useful practical implication most competitor content skips: a jar with high DHA but a lower current MGO reading may still be climbing in potency as it sits. That’s not a flaw, it’s the same compound relationship covered in more detail elsewhere in this cluster, just relevant here because DHA is one of the numbers you’ll actually see printed on a certificate.
HMF: Why Lower Is Better Here
This is the one marker on a certificate where the instinct to want a higher number works against you. HMF doesn’t measure potency at all, it accumulates as honey is exposed to heat or ages in storage, so a rising HMF reading is a sign of damage, not quality.
A UMFHA-licensed jar with a low HMF reading is telling you the honey hasn’t been mishandled since testing. A high one means it likely has, regardless of what the UMF or MGO number says elsewhere on the same certificate.
A Quick Note on NPA
NPA (non-peroxide activity) is an older term describing roughly the same antibacterial property UMF and MGO track, on its own separate scale. It has nothing to do with Wedderspoon’s KFactor system, which measures Manuka pollen count instead, an entirely different kind of marker answering a different question. For the full side-by-side comparison of UMF, MGO, KFactor, and NPA, see the full grading systems comparison.
Putting It Together: Reading a Full Certificate
Here’s what actually finding these on a real certificate looks like. I pulled up a Comvita batch certificate specifically to check this: the UMF and MGO numbers sit at the top as the headline figures, with the UMFHA license number nearby confirming the brand behind them. Leptosperin, DHA, and HMF are listed further down as separate line items, easy to skip past if you’re only glancing at the top of the page.
Reading the whole thing takes maybe thirty seconds once you know what each line means. The headline number tells you the grade. The lines below it tell you whether that grade is backed by genuine origin (leptosperin), still developing (DHA), and undamaged since testing (HMF, checked for a low reading).
FAQ
Do all brands list leptosperin, DHA, and HMF?
Most UMFHA-licensed brands do, since they’re part of the standard four-marker UMF test. Brands using MGO-only or KFactor labeling may not list all three, since those systems don’t test for the same markers UMF does.
Should I avoid a jar if HMF isn’t listed?
Not automatically, but it’s worth asking why. A UMF-certified jar should have HMF data available even if it’s not printed on the retail label, since it’s part of the required testing. If a brand can’t produce it on request, that’s a more meaningful red flag than the label alone.
Is leptosperin the same thing as UMF?
No. UMF is a certification built from four markers, including leptosperin, MGO, DHA, and HMF together. Leptosperin is just one of those markers, specifically the one confirming genuine Manuka origin rather than potency.