Comparison
Magnesium L-Threonate vs Astaxanthin
Magnesium L-Threonate
MIT-developed magnesium that crosses the blood-brain barrier. Shown to enhance synaptic density and reduce 'brain age'.
Astaxanthin
Red carotenoid pigment with high antioxidant potency. Crosses the blood-brain barrier and the blood-retinal barrier. Found in salmon, krill, and microalgae.
| Field | Magnesium L-Threonate | Astaxanthin |
|---|---|---|
| Category | neuroprotective | neuroprotective |
| Dose range | 1000–2000mg | 4–12mg |
| Half-life | 6h | — |
| Onset | — | — |
| Evidence | EVIDENCEB | EVIDENCEB |
| Safety | ●●●●● | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 90 | 2700 |
The comparison in plain English
Auto-generated from dataMagnesium L-Threonate and Astaxanthin are both in the neuroprotective category respectively. Magnesium L-Threonate MIT-developed magnesium that crosses the blood-brain barrier. Astaxanthin Red carotenoid pigment with high antioxidant potency.
Bottom line
Magnesium L-Threonate (evidence B, safety 5/5) matches the evidence base of Astaxanthin (evidence B, 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 Astaxanthin if
Astaxanthin is the better fit when your goal aligns with its mechanism (A red carotenoid with antioxidant capacity approximately 500-1000x stronger than vitamin E and 10x stronger than beta-carotene by some measures) and the dose range (4–12mg) suits your protocol. Half-life is —h.