Quick Comparison

Magnesium GlycinateOmega-3 (DHA)
Half-Life12-17 hours20-67 hours (plasma), but brain DHA turns over slowly over weeks
Typical DosageStandard: 200-400 mg elemental magnesium daily (note: magnesium glycinate is ~14% elemental magnesium by weight, so 2000 mg magnesium glycinate provides ~280 mg elemental). Take in the evening for sleep benefits. Can be split into 2 doses.Standard: 1-2 g combined EPA/DHA daily (aim for at least 500 mg DHA). For depression: 1-2 g EPA-dominant fish oil. Triglyceride form is better absorbed than ethyl ester. Take with a fatty meal.
AdministrationOral (capsules, powder, tablets). Well-tolerated. Take with or without food.Oral (softgels, liquid). Triglyceride or phospholipid forms preferred over ethyl ester for bioavailability. Take with food containing fat.
Research Papers8 papers10 papers
Categories

Mechanism of Action

Magnesium Glycinate

Magnesium is required for over 300 enzymatic reactions including neurotransmitter synthesis (tyrosine hydroxylase, tryptophan hydroxylase), energy production (ATPases, kinases, glycolytic enzymes), and DNA repair (PARP, DNA polymerases). In the brain, magnesium blocks NMDA receptors at the voltage-dependent Mg2+ binding site within the channel pore (GluN1/GluN2 subunits), preventing excessive calcium influx and excitotoxicity — Mg2+ is displaced only upon depolarization and glycine/glutamate binding. The glycine component activates inhibitory glycine receptors (GlyR alpha1/alpha2) in the brainstem and spinal cord, and serves as an obligatory co-agonist at the GluN1 glycine site of NMDA receptors. Glycine also modulates NMDA receptor function. Together, magnesium and glycine produce calming effects through complementary inhibitory mechanisms: reduced glutamatergic excitability and enhanced inhibitory neurotransmission.

Omega-3 (DHA)

DHA is a structural component of neuronal phospholipids (particularly phosphatidylethanolamine and phosphatidylserine in synaptic membranes), maintaining membrane fluidity which is essential for G-protein-coupled receptor function, ion channel gating, and synaptic vesicle fusion. DHA is metabolized by 15-lipoxygenase to specialized pro-resolving mediators (SPMs) including neuroprotectin D1 (NPD1), which actively resolve neuroinflammation by reducing NF-kappaB activation and pro-inflammatory cytokine production. DHA supports BDNF expression through modulation of the CREB pathway and promotes synaptic plasticity by enhancing long-term potentiation (LTP) and dendritic spine density. It also influences neurotransmitter receptor conformation and binding efficiency. Deficiency impairs membrane signaling, increases neuroinflammation, and accelerates cognitive decline.

Risks & Safety

Magnesium Glycinate

Common

Mild drowsiness (often desired), loose stools at high doses (less than with other forms).

Serious

Avoid high doses with kidney impairment.

Rare

Diarrhea, nausea.

Omega-3 (DHA)

Common

Fishy aftertaste, burping, mild gastrointestinal discomfort.

Serious

High doses (>3 g/day) may increase bleeding risk — caution with blood thinners. Fish oil quality matters — choose products tested for mercury and oxidation.

Rare

Allergic reaction in people with fish/shellfish allergy.

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