UMF Mānuka Honey 20+Key Features UMF 20+ guarantees the level of UMF is between UMF 20 and UMF 25 The special UMF property is not found in all Manuka honey Natural alternative to sugar and sweeteners. 100% New Zealand made. No added colours, additives, flavours or preservatives. Each batch of UMF Manuka honey is tested and certified by accredited laboratories in New Zealand. How It Works: The UMF grading system appraises natural markers found in Manuka honey, and assures