Comparison
Magnesium L-Threonate vs Lutein + Zeaxanthin
Magnesium L-Threonate
MIT-developed magnesium that crosses the blood-brain barrier. Shown to enhance synaptic density and reduce 'brain age'.
Lutein + Zeaxanthin
Macular carotenoids that protect retinal tissue from oxidative damage. Multiple RCTs support reduced age-related macular degeneration progression.
| Field | Magnesium L-Threonate | Lutein + Zeaxanthin |
|---|---|---|
| Category | neuroprotective | neuroprotective |
| Dose range | 1000–2000mg | 10–20mg |
| Half-life | 6h | — |
| Onset | — | — |
| Evidence | EVIDENCEB | EVIDENCEA |
| Safety | ●●●●● | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 90 | 3500 |
The comparison in plain English
Auto-generated from dataMagnesium L-Threonate and Lutein + Zeaxanthin are both in the neuroprotective category respectively. Magnesium L-Threonate MIT-developed magnesium that crosses the blood-brain barrier. Lutein + Zeaxanthin Macular carotenoids that protect retinal tissue from oxidative damage.
Bottom line
Magnesium L-Threonate (evidence B, safety 5/5) has a stronger evidence base than Lutein + Zeaxanthin (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 Lutein + Zeaxanthin if
Lutein + Zeaxanthin is the better fit when your goal aligns with its mechanism (Concentrated in the macula lutea (yellow spot) of the retina, where they absorb high-energy blue light and quench reactive oxygen species) and the dose range (10–20mg) suits your protocol. Half-life is —h.