You can choose a Factor 10 or 15 Manuka Honey with even stronger antibacterial activity.UMF is a Registered Trademark & indicates the antibacterial strength of the Unique Manuka Factor. Extra strength honeys with a guaranteed UMF of 10 or 15. The Active 10 has two & a half times the killing power of standard antiseptic Active 10 15 are effective both internally & externally