Comvita Manuka Honey UMF™ 5+ Comvita Manuka Honey UMF™ 5+ offers a high-quality selection of Manuka honey for everyday use. It boasts the Unique Manuka Factor (UMF™) 5+ and an MGO rating of 83+, exceeding the minimum required level for pure Manuka honey. MGO stands for Methylglyoxal, an indicator of the special properties of Manuka honey. The minimum permitted MGO level for pure Manuka honey is 80+.