Magnesium L-threonate

Magnesium L-threonate is a specialized form of magnesium where the mineral is chelated with L-threonic acid, a metabolite of Vitamin C. Developed by a team of neuroscientists at MIT, it was designed specifically to overcome the low brain-bioavailability of traditional magnesium supplements. Unlike common forms such as magnesium oxide or citrate, L-threonate has a unique ability to cross the blood-brain barrier effectively, significantly elevating magnesium concentrations within the brain and cerebrospinal fluid.

This supplement works by crossing the blood-brain barrier to increase the density and plasticity of synapses—the connections between neurons. Research suggests it upregulates NMDA receptors (specifically the NR2B subunit), which are critical for learning and memory formation. By optimizing brain magnesium levels, it supports synaptic plasticity, promotes neurogenesis in the hippocampus, and modulates GABA receptors to help regulate the nervous system's response to stress, potentially improving both cognitive clarity and sleep quality.

The clinically studied daily dosage for adults is typically 1,500 mg to 2,000 mg, providing approximately 144 mg to 250 mg of elemental magnesium. Research suggests splitting the dose: one in the morning for cognitive support and one in the evening (1-2 hours before bed) to assist with sleep. Safety Warning: Individuals with severe renal impairment (creatinine clearance <30 mL/min) should avoid supplementation due to the risk of hypermagnesemia. It is advised to start with a lower dose to assess tolerance and consult a physician if taking medications for blood pressure or osteoporosis.