Quick Comparison

CreatineMagnesium L-Threonate
Half-Life3 hours (plasma), but tissue stores persist for weeks2-3 hours (threonate carrier), but brain magnesium levels increase cumulatively
Typical DosageStandard: 3-5 g daily (no loading phase needed for cognitive effects). Loading (optional): 20 g daily for 5-7 days, then 3-5 g maintenance. Creatine monohydrate is the most studied form.Standard: 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).
AdministrationOral (powder, capsules). Creatine monohydrate is the gold standard form with the most research support.Oral (capsules, powder). The L-threonate form is specifically chosen for brain penetration.
Research Papers10 papers10 papers
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Mechanism of Action

Creatine

Creatine is phosphorylated by mitochondrial creatine kinase (CK-Mt) to form phosphocreatine (PCr), which serves as a rapidly mobilizable high-energy phosphate reserve. When neuronal ATP is consumed during demanding tasks (synaptic vesicle cycling, ion pump activity, action potential propagation), cytosolic brain-type creatine kinase (CK-BB) catalyzes the transfer of the phosphoryl group from PCr to ADP, regenerating ATP within milliseconds — far faster than oxidative phosphorylation or glycolysis can respond. This PCr/CK shuttle also transports high-energy phosphates from mitochondria to distant synaptic sites. Creatine provides direct neuroprotection by stabilizing the mitochondrial permeability transition pore (mPTP), preventing cytochrome c release and downstream apoptotic cascades. It scavenges reactive oxygen species by acting as a direct antioxidant against superoxide and peroxynitrite. Creatine also increases GLUT4 expression in neurons, improving glucose uptake, and upregulates brain-derived neurotrophic factor (BDNF) expression in the hippocampus, supporting synaptic plasticity and memory consolidation.

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.

Risks & Safety

Creatine

Common

Water retention (mild weight gain), gastrointestinal discomfort at high doses.

Serious

Very safe — one of the most studied supplements in existence. No kidney damage in healthy individuals.

Rare

Muscle cramping, dehydration if water intake is insufficient.

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).

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