The Unique Mānuka Factor (UMF) symbol measures unique signature compounds of authentic Mānuka honey, including Leptosperin, DHA and MGO. Every batch is independently analysed and certified for quality, purity and authenticity by the UMF Honey Association (Licence number: 1088) – which also randomly tests Mānuka honey to ensure carrying the UMFmark is true to what it says on the jar.