Manuka honey is made from nectar from the flowers of the Manuka tree (Leptospermum scoparium), native to New Zealand, and is known for its unique antibacterial properties that are stable and long lasting. These antibacterial properties are attributed to naturally occurring methylglyoxal (MGO) in manuka honey. The level of antibacterial activity is related to the concentration of MGO in the honey as determined by laboratory testing. The UMF and MGO scales are used to determine the level of antibacterial activity in manuka honey. Learn more.