Quick Comparison

Magnesium L-ThreonateReishi
Half-Life2-3 hours (threonate carrier), but brain magnesium levels increase cumulativelyBioactive compounds accumulate with daily use
Typical DosageStandard: 1500-2000 mg Magnesium L-Threonate daily (providing 144 mg elemental magnesium). Often split into a daytime dose and a pre-bed dose. The Magtein brand uses 2000 mg daily (667 mg three times).Standard: 1000-3000 mg daily of extract. Dual-extract (water + alcohol extraction) preferred to capture both polysaccharides and triterpenes. Take in the evening due to calming effects. Spore oil: 500-1000 mg daily. Effects build over 2-4 weeks.
AdministrationOral (capsules, powder). The L-threonate form is specifically chosen for brain penetration.Oral (capsules, powder, tincture, tea). Dual-extract preferred. Bitter taste in powder/tea form.
Research Papers10 papers8 papers
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Mechanism of Action

Magnesium L-Threonate

The L-threonate carrier forms stable complexes with magnesium and transports it across the blood-brain barrier via specific transporters more effectively than inorganic magnesium salts or other chelated forms. Once in the brain, magnesium acts as a voltage-dependent blocker of the NMDA receptor channel at the physiological magnesium binding site within the ion pore, preventing excessive calcium influx and glutamate-mediated excitotoxicity. Magnesium also serves as a cofactor for over 300 enzymes including those involved in neurotransmitter synthesis (tyrosine hydroxylase, glutamic acid decarboxylase), ATP production (creatine kinase, pyruvate kinase), and DNA/RNA polymerase. Elevated brain magnesium enhances synaptic density and plasticity in the hippocampus and prefrontal cortex, likely through CREB-mediated gene expression and increased density of postsynaptic AMPA receptors.

Reishi

Reishi's triterpenes (ganoderic acids A, C, D, H; ganoderenic acids) modulate the HPA axis by reducing CRH and ACTH release, lowering cortisol via glucocorticoid receptor feedback. Ganoderic acids have direct sedative effects through GABA-A receptor modulation (possibly allosteric at the benzodiazepine site) and 5-HT2A/2C serotonergic modulation. Beta-(1,3)-(1,6)-glucan polysaccharides bind Dectin-1 and complement receptor 3 (CR3) on macrophages, natural killer cells, and dendritic cells, activating NF-kB and MAPK signaling for immune modulation. Reishi inhibits histamine release from mast cells via Fc epsilon RI downregulation and stabilizes mast cell membranes (anti-allergic effect). Antioxidant properties involve upregulation of superoxide dismutase (SOD1/SOD2), catalase, and glutathione peroxidase. Ganoderic acids may also inhibit 5-alpha-reductase and ACE.

Risks & Safety

Magnesium L-Threonate

Common

Drowsiness (often desired for sleep), mild headache initially, gastrointestinal discomfort.

Serious

None documented at standard doses. Magnesium toxicity is not a concern with oral supplementation in people with normal kidney function.

Rare

Diarrhea (less common than with other magnesium forms).

Reishi

Common

Digestive discomfort, dry mouth, dizziness.

Serious

Rare hepatotoxicity reported — avoid with liver disease. May interact with blood thinners and immunosuppressants.

Rare

Allergic reaction, nosebleeds.

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