Manuka Health MGO 400+ UMF13 Manuka HoneyScientific evidence has confirmed methylglyoxal as one of the key compounds naturally occurring in New Zealand manuka honey. Methylglyoxal is only found in significant quantities in some manuka honey and levels can vary greatly, so testing and certification of each batch is important to guarantee methylglyoxal content. Every batch of MGO Manuka Honey is tested and certified for guaranteed quality and methylglyoxal content as indicated on the label.