Threonate is a chemical compound that is derived from the amino acid threonine. It is often used as a salt form, called threonate salt, which has specific properties and uses in science and medicine. Full definition
I am surprised you don't have Magnesium L - Threonate on your list, Latest research show it's fabulous for the brain unlike other forms of Magnesium. (ketodietapp.com)
One study concluded that magnesium threonate increases the number of synaptic connections between brain cells and boosts the density of synapses (30). (healthy-holistic-living.com)
In the case of Mind - Mag, we have magnesium that is attached to the amino acid threonate which yields some very special and unique characteristics and outcomes. (atplab.com)