Short answer: MGO stands for methylglyoxal, a naturally occurring compound measured in Manuka honey. An MGO number states the minimum measured concentration in milligrams per kilogram—for example, MGO 500+ means at least 500 mg/kg.
What the number after MGO tells you
The number is a concentration, not a dose. MGO 100+ indicates at least 100 mg/kg of methylglyoxal, while MGO 1000+ indicates at least 1000 mg/kg. The plus sign means the measured result meets or exceeds the stated threshold.
Because the unit is milligrams per kilogram, the rating stays the same whether the product is sold in a 250g or 500g jar. Jar size changes how much honey you receive, not its labelled strength.
Why MGO appears on Manuka honey labels
Methylglyoxal is associated with the characteristic non-peroxide activity studied in Leptospermum honeys. A clearly stated MGO rating gives shoppers a consistent number for comparing products within a range.
MGO should be read as a product specification. It does not by itself describe flavour, provenance, freshness or value, and it is not a medical recommendation.
Common MGO ratings at a glance
Australian Honey Co. currently presents its Puspamrta Manuka collection in these practical groups:
- MGO 100+ and 263+: approachable everyday selections
- MGO 500+: a popular stronger option
- MGO 900+: a high-strength grade
- MGO 1000+ and 1282+: premium-grade selections
- MGO 1450+ and 1600+: rare Vintage Grade selections
How to use MGO when choosing
Start by deciding how you plan to enjoy the honey and what flavour intensity you prefer. Then compare the price, jar size and exact grade. An everyday lower-MGO jar may suit regular breakfast use, while someone seeking a rarer, more concentrated Manuka selection may prefer a premium or Vintage Grade jar.
Sources and further reading
Information notice: This article provides general food and product information, not medical advice. Honey is not suitable for infants under 12 months; see Healthdirect's infant safety information.