What Is MGO in Manuka Honey — And Why 512+ Matters

If you've spent any time researching Manuka honey, you've seen "512+" thrown around — but what does it actually mean, and why should you care?

What Is MGO?

MGO stands for methylglyoxal — the naturally occurring compound responsible for Manuka honey's powerful antibacterial properties. Unlike regular honey, which relies primarily on hydrogen peroxide, Manuka honey contains MGO in uniquely high concentrations. The higher the MGO number, the more potent the honey.

How MGO Is Measured

MGO is measured in milligrams per kilogram (mg/kg) of honey. A rating of 512+ MGO means the honey contains a minimum of 512mg of methylglyoxal per kilogram. This is independently verified by MPI-registered New Zealand laboratories — not self-reported, not estimated.

At Golden Reserve, every single batch is tested before it reaches you. We publish the results. No cherry-picking. No hiding the batches that don't perform.

Why 512+ and Not Lower?

Lower MGO honeys (100-250 range) are widely available and significantly cheaper. But research suggests that meaningful antibacterial activity becomes pronounced at higher concentrations. We chose 512+ as our minimum standard because if you're investing in Manuka honey, it should actually work.

The Bottom Line

When choosing Manuka honey, the MGO number is the most direct measure of potency. At Golden Reserve, 512+ MGO means independently verified, single-origin potency — from one apiary in New Zealand's Manuka-rich wilderness, never blended, never heated above hive temperature.

That's not marketing. That's just what real Manuka honey looks like.