Put simply, ULTRA MAG is just what its name suggests, the highest quality, most bio-available form of organic magnesium in the world. It is made from a metal proteinate which is the highest quality most stable form of a chelate, and not simply an amino acid 'complex' or lesser form of magnesium.
The reality is that Ultra Mag is the only form of magnesium available in NZ that really deserves the title of organic magnesium. It is so effective that a smaller dose is needed, that is why you will see it in a lower concentration per dose than some other products.
Ultra Mag is available in 500g packets and has a 10g dose.