Why is Comvita UMF® 20+ so special? Comvita’s UMF 20+ Manuka Honey is produced in New Zeal&. UMF® stands for ‘ Unique Manuka Factor’, a quality measure unique to honey made from the nectar of the Manuka (Leptospermum scoparium) bush, native to New Zeal&. Every batch of Manuka honey from Comvita is tested by accredited laboratories registered to measure the UMF® level. All batches are assessed by qualified technicians for flavour, colour & aroma. Only selected Manuka honey producers can carry the UMF® trademark, which is highly sought-after within the Manuka Honey Industry. Unlike honeys labeled as ‘ Active’, Comvita’s UMF honey has been tested & verified as ‘UMF’ certified which guarantees that Comvita’s honey contains at least the levels of antibacterial properties stated on the jar label.