When it comes to manuka honey, it's important to know what you're buying. I recently learned a lot from Manuka Honey Singapore about how honey is rated and certified. We are all very familiar with the MGO (Methylglyoxal) number that measures this antibacterial compound in honey.
However, there is a more complete and advanced grading system called the Unique Manuka Factor or UMF that measures not just MGO but also Leptosperin (the natural chemical only found from Manuka plants) and DHA. The UMF rating certifies genuine Manuka honey from New Zealand. This number is usually between 5 to 25, and the MGO numbers are usually higher, so this can cause confusion when you're buying manuka honey.