@Romla ....
Proper Medical Grade Manuka Honey is collected in NZ & has specific healing properties that is anti bacterial & has been sterilised (read the info below.) I believe that every 'batch' has to be tested to maintain the 'Medical Grade' rating. The name comes from the Tree that the bees harvest from - usually found on coastal edges .....it is a variety of 'Ti Tree'. It costs more than 'eating honey' - so you probably wouldn't use it in your tea or on toast! ;)
http://www.woundsaustralia.com.au/journal/1903_14.pdf Australia has their own version from the Aussie Ti Trees, too (sometimes called Jelly Bush.)