The UMF® grading system has two components which are expressed on any UMF® licenced honey product: 1. The label claim that it is Genuine Manuka, 2. The number - This represents the unique signature compounds characteristic of this honey which ensure purity and quality. These include: the key markers of Leptosperin, DHA and Methylglyoxal. For more information visit www.umf.org.nz/grading-system-explained.