MPI, NPA, MGO and UMF™
In 2015, New Zealand’s Ministry for Primary Industries (MPI) began developing a test to define Manuka honey. By 2018, they introduced a 5-marker test (four chemical markers and a DNA test) to verify Manuka honey, ensuring all Manuka honey packed in NZ met this standard. This gave consumers confidence in its authenticity.
Prior to 2018, the UMF™ association conducted research and identified a marker called Leptosperin, found in high levels in Manuka honey. However, the NZ government opted for the 5-marker test instead. Testing changes also prohibited using grading systems like Non-Peroxide Activity (NPA) in marketing, as the word 'Activity' is not allowed. As a result, the UMF™ grading system had to adapt.
Meanwhile, MGO remained an acceptable grading method since it measures methylglyoxal levels (mg/kg), providing a clear indicator of antibacterial strength. Today, most countries recognize MGO as the best measure of Manuka honey potency.