Comvita UMF Manuka Honey has been on healthfood shelves since 1974. It is UMF certified which means you can trust that what is on the label is what is in the jar. UMF stands for Unique Manuka Factor; it is a measure of the unique type of activity naturally present in Manuka Honey. The trademark UMF is an independent certificate which measures every batch to ensure you buy the highest quality of honey. Comvita is 1 of only 38 Producers certified with the UMF stamp of approval.