What Does MGO Stand For?
MGO stands for Methylglyoxal, the key naturally occurring compound responsible for the unique antibacterial properties of Manuka honey. Unlike regular honey, which relies primarily on hydrogen peroxide for its antimicrobial action, Manuka honey derives much of its potency from this stable, heat-resistant compound.
The MGO rating on a jar of Manuka honey tells you exactly how many milligrams of Methylglyoxal are present per kilogram of honey. The higher the number, the more concentrated the active compound — and generally, the stronger its potential therapeutic effects.
How Is MGO Measured?
MGO levels are determined through independent laboratory testing. Reputable Manuka honey producers send samples to accredited labs where scientists use high-performance liquid chromatography (HPLC) to precisely measure the Methylglyoxal concentration. This is why trustworthy jars always carry a lot number and third-party certification.
It's worth understanding that MGO is derived from a precursor compound called dihydroxyacetone (DHA), which is found in the nectar of the Leptospermum scoparium (Manuka) flower. As the honey matures, DHA converts into MGO — a process that continues slowly over time, which is why older, well-stored Manuka honey can sometimes test higher than when it was first bottled.
The MGO Rating Scale at a Glance
| MGO Rating | UMF Equivalent | Common Use Case |
|---|---|---|
| MGO 55+ | UMF 5+ | Daily wellness, general health maintenance |
| MGO 100+ | UMF 6+ | Digestive support, immunity boost |
| MGO 263+ | UMF 10+ | Stronger therapeutic use, skin care |
| MGO 514+ | UMF 15+ | Targeted health applications |
| MGO 829+ | UMF 20+ | High-potency therapeutic purposes |
| MGO 1200+ | UMF 26+ | Premium, highest-strength grade |
MGO vs. UMF: What's the Difference?
You'll often see two grading systems on Manuka honey labels: MGO and UMF (Unique Manuka Factor). Both measure the potency of Manuka honey, but they approach it slightly differently.
- MGO measures only the Methylglyoxal concentration directly.
- UMF is a broader quality trademark that also accounts for other markers of authenticity, including leptosperin (a compound unique to genuine Manuka honey) and DHA levels.
Both are valid indicators. MGO is straightforward and easy to compare; UMF provides a more holistic quality stamp. Many premium jars display both ratings.
Which MGO Rating Is Right for You?
Choosing the right grade depends on your intended use:
- For everyday use and taste — MGO 55+ to MGO 100+ is a great starting point. It's pleasant to eat daily and offers a gentle introduction to Manuka honey's benefits.
- For digestive and immune support — MGO 263+ (UMF 10+) is widely considered the entry point for noticeable therapeutic effects.
- For wound care and skin applications — MGO 514+ and above is typically recommended, though always consult a healthcare provider for medical use.
- For premium wellness routines — MGO 829+ offers maximum potency for those seeking the highest-grade honey available.
Why the Rating Matters for Quality Assurance
Not all honey labeled "Manuka" is genuine or potent. The MGO rating, when backed by independent lab testing and certification, is your assurance that you're getting what you pay for. Always look for a visible lot number on the jar so you can verify the certificate of analysis from the manufacturer. This transparency is the hallmark of a reputable producer.
Understanding MGO ratings empowers you to make informed decisions — whether you're buying Manuka honey for its distinctive flavor, for daily wellness, or for specific therapeutic applications.