Abstract: The present composition comprises magnesium-L-threonate and a neurotransmitter such as, but not limited to phosphatidylserine and optionally, at least one of vitamin C, vitamin B6, and vitamin D3. The composition has been shown to increase at least one of memory or cognition in clinical study subjects. The present disclosure is further directed to methods of identifying and a subject with a memory or cognitive deficiency and administering a therapeutically effective amount of a formula comprising magnesium-L-threonate and a neurotransmitter to improve the memory and/or cognitive deficiency. In some implementations, the magnesium-L-threonate is Magtein®. It is also intended that any other neurotransmitter that results in a synergistic composition of the magnesium-L-threonate and the neurotransmitter by administered to improve a subject's memory and/or cognition.