We sell more 10+ UMF®-rated Manuka Honey than any other and it's probably the most popular of all UMF® Manuka Honeys. UMF® Manuka Honey contains hydrogen peroxide plus its own natural antibacterial properties. It is this unique, additional activity that gives it the special antibacterial healing potency and UMF® 15+ Manuka Honey has very useful strength of therapeutic properties.