Active UMF25+ Manuka Honey has a special anti-bacterial activity called Unique Manuka Factor (UMF). Laboratory research has shown that the UMF and hydrogen peroxide found in this honey kills bacteria and fungi found in wounds and stomach ulcers. Active UMF 25+ Manuka Honey has been tested and certified by independent laboratories. Active UMF25+ Manuka Honey has naturally occurring properties which can assist your body against harmful bacteria. It is the most biologically active honey in the world.