Comparison
Magnesium L-Threonate vs L-Theanine
Magnesium L-Threonate
MIT-developed magnesium that crosses the blood-brain barrier. Shown to enhance synaptic density and reduce 'brain age'.
L-Theanine
An amino acid found almost exclusively in tea leaves. Promotes relaxed alertness via alpha-wave promotion and GABA/serotonin/dopamine modulation. Pairs with caffeine in a 1:2 ratio to produce the most-validated focus synergy in the nootropic literature. Essentially no side-effect or interaction profile at typical doses.
| Field | Magnesium L-Threonate | L-Theanine |
|---|---|---|
| Category | neuroprotective | amino-acid |
| Dose range | 1000–2000mg | 100–400mg |
| Half-life | 6h | 1h |
| Onset | — | 30min |
| Evidence | EVIDENCEB | EVIDENCEA |
| Safety | ●●●●● | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 90 | 720 |
The comparison in plain English
Auto-generated from dataMagnesium L-Threonate and L-Theanine are both in the neuroprotective (neuroprotective) and amino-acid respectively. Magnesium L-Threonate MIT-developed magnesium that crosses the blood-brain barrier. L-Theanine An amino acid found almost exclusively in tea leaves.
Bottom line
Magnesium L-Threonate (evidence B, safety 5/5) has a stronger evidence base than L-Theanine (evidence A, safety 5/5). Magnesium L-Threonate has the slightly cleaner safety profile. For users new to either, the higher-evidence option is the safer first try.
Choose Magnesium L-Threonate if
Magnesium L-Threonate is the better fit when your goal aligns with its mechanism (L-threonate is a sugar-acid carrier that uniquely enables magnesium to cross the blood-brain barrier in meaningful quantities — most oral magnesium forms (oxide, citrate, glycinate) raise serum magnesium but not central magnesium) and the dose range (1000–2000mg) suits your protocol. Half-life is 6h.
Choose L-Theanine if
L-Theanine is the better fit when your goal aligns with its mechanism (Crosses the blood-brain barrier within ~30 minutes of oral dosing) and the dose range (100–400mg) suits your protocol. Half-life is 1h.