Our UMF™ 25+ (MGO 1200+) Manuka honey is our highest and purest grades of manuka available. Strong in taste and methyglyoxal. Enjoy this straight on the spoon or excellent for topical use on the skin. The UMF™ rating system independently certifies natural components found in manuka honey to assure potency, purity, authenticity, & freshness. UMF licence number: 3143 The MGO number on the front of the jar represents the mg per kg of MGO (Methylglyoxal) and the related strength of Antimicrobial Activity, which is known to kill certain types of bacteria. The greater the number, the stronger the Antimicrobial Activity.