Magnesium & Ketamine Therapy

Why Magnesium Matters

Magnesium is an essential mineral involved in over 300 enzymatic reactions including nerve signaling, mitochondrial energy production, muscle function, sleep regulation, and stress response. In the brain, magnesium acts at the NMDA receptor as a physiologic voltage-dependent blocker that regulates calcium entry and excitatory signaling.

Magnesium L-Threonate (Magtein®) is unique because preclinical studies demonstrate it can increase brain magnesium levels, improve synaptic density, enhance long-term potentiation (LTP), and support neuroplasticity. These mechanisms are directly relevant to ketamine’s therapeutic effects.

Glutamate Regulation & Neuroplasticity

Ketamine transiently blocks NMDA receptors on inhibitory interneurons, producing a glutamate surge. This increases AMPA receptor activation, stimulates brain-derived neurotrophic factor (BDNF) release, activates mTOR signaling, and promotes synaptogenesis. While this surge is necessary for therapeutic plasticity, excessive glutamate activity may contribute to post-infusion symptoms such as headache, agitation, or sleep disruption.

Magnesium acts as a natural stabilizer of NMDA receptor function. Adequate intracellular magnesium buffers calcium influx, reduces excitotoxic stress, supports mitochondrial stability, and helps optimize the synaptic remodeling process initiated by ketamine. By increasing brain magnesium availability, magnesium L-threonate may help consolidate and stabilize ketamine-induced plasticity.

Common Forms of Magnesium

Magnesium L-Threonate Dosing Around Ketamine Treatment

On treatment days: • 1,000 mg magnesium L-threonate approximately 2–3 hours before ketamine treatment • 1,000 mg magnesium L-threonate later the same day after treatment (often in the evening). This provides a total of 2,000 mg on treatment days, consistent with standard supplemental ranges.

Safety Considerations

Magnesium supplementation is generally safe but should be used cautiously in patients with kidney disease, low blood pressure, heart rhythm disorders, or those taking multiple sedating medications. Possible side effects include mild sedation, stomach upset, or loose stools. Always inform your provider about all medications and supplements you are taking.