UMF vs MGO — What's the Difference and Which Matters More?

Every jar of Mānuka honey seems to have a different number on it. UMF 15+. MGO 500+. MGO 1000+. UMF 20+. If you're trying to work out what you're actually buying, it gets confusing fast. Our FAQ page has quick answers — this article goes deeper.

Already know the difference between UMF and MGO and want to choose which grade to buy? Skip ahead to the UMF Rating Decoder — Which Grade for Which Use Case.

What MGO Measures

MGO stands for methylglyoxal. It's the compound responsible for Mānuka honey's unique antibacterial activity — and unlike the hydrogen peroxide found in regular honey, MGO doesn't degrade under light, heat, or storage. It's stable, which is part of why Mānuka honey retains its potency over time.

MGO is measured in milligrams per kilogram (mg/kg). A jar labelled MGO 514+ contains at least 514mg of methylglyoxal per kilogram of honey. Higher numbers = more potency.

The problem with MGO alone: it only tells you what's in the jar right now. It doesn't tell you whether the honey is genuinely from the Mānuka flower, or whether it's been adulterated with cheap filler.

What UMF Measures

UMF stands for Unique Mānuka Factor, and it's a grading system managed by the Unique Mānuka Factor Honey Association (UMFHA) — an independent industry body. To earn a UMF grade, honey must be tested for three markers:

1. MGO — potency
2. Leptosperin — a chemical compound unique to Mānuka flower nectar that proves origin authenticity
3. DHA — a precursor to MGO that converts over time, which indicates the honey will maintain potency through its shelf life

UMF is the more comprehensive test. It's harder to fake because leptosperin is only found in genuine Mānuka nectar — you can't add it artificially.

How They Convert

As a rough guide:

• UMF 10+ ≈ MGO 263+
• UMF 15+ ≈ MGO 514+
• UMF 20+ ≈ MGO 829+
• UMF 25+ ≈ MGO 1200+

These conversions aren't perfectly linear because DHA contributes to UMF grading — a honey with lower current MGO but high DHA can still achieve a high UMF grade because it'll convert over time.

Which One to Trust?

For everyday buying decisions: look for both. A jar with UMF 15+ certification and an MGO of 514+ is the gold standard. It's potent, it's authentic, and a third-party body has verified it.

If a jar only shows MGO with no UMF certification, be more cautious. The company is making a potency claim without an independent authenticity check. That's not automatically a red flag — some legitimate producers test independently — but it warrants scrutiny. Ask if they'll share their lab report.

If a jar only shows UMF with no MGO number, that's fine — UMF grading includes MGO testing, so the potency is covered. Just check the conversion table above to understand what you're getting.

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Related Mānuka Honey Guides on NZ Country Mānuka

• UMF Rating Decoder: Which Grade for Which Use Case — now that you understand UMF vs MGO, this is the practical buying guide: UMF 5+ for the kitchen, 10+ for daily wellness, 15+ for therapeutic use, 20+ for acute support.
• Mānuka Honey Certifications Buyer's Guide — UMF, MGO, MGS, NPA — the four honey certifications that matter, decoded.
• Mānuka Honey vs Supermarket Honey — Lab Test Comparison — MGO ppm, antibacterial activity, pollen-origin verification.
• Mānuka Oil vs Mānuka Honey — Which to Buy First — same plant, different products, completely different use cases.

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The East Cape Difference

One thing neither UMF nor MGO tells you on its own: where the Mānuka came from. East Cape New Zealand produces honey with naturally higher MGO levels than any other region — the plant's genetics in that specific coastal environment drive exceptional β-triketone compound production. Two jars, both UMF 15+, can have meaningfully different character depending on origin.

Our UMF 15+ East Cape Mānuka Honey is sourced exclusively from East Cape, certified by the UMFHA, and MGO 514+ verified by independent lab test. The certificate is available to download on the product page — no black box.

The Short Answer

UMF is the more complete certification. MGO is the most direct potency measure. Together, they're the clearest signal that a jar of Mānuka honey is worth buying. On their own, each tells part of the story. The brands worth trusting are happy to show you both.