MGO 55+ refers to the level of MGO or methylglyoxal in the Manuka honey. MGO 55+ is however quite a low level is some Manuka honey can contain a level of 800+ or higher
Manuka Doctor Manuka Honey MGO 55
Another in the range of multifloral manuka honeys from Manuka Doctor. This 500g jar uses the MGO rating scale and has been independently tested and certified.