Comparison
Magnesium L-Threonate vs Spermidine
Magnesium L-Threonate
MIT-developed magnesium that crosses the blood-brain barrier. Shown to enhance synaptic density and reduce 'brain age'.
Spermidine
Polyamine found in wheat germ, aged cheese, soybeans. Induces autophagy — cellular cleanup linked to longevity.
| Field | Magnesium L-Threonate | Spermidine |
|---|---|---|
| Category | neuroprotective | neuroprotective |
| Dose range | 1000–2000mg | 1–5mg |
| Half-life | 6h | — |
| Onset | — | — |
| Evidence | EVIDENCEB | EVIDENCEB |
| Safety | ●●●●● | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 90 | 6800 |
The comparison in plain English
Auto-generated from dataMagnesium L-Threonate and Spermidine are both in the neuroprotective category respectively. Magnesium L-Threonate MIT-developed magnesium that crosses the blood-brain barrier. Spermidine Polyamine found in wheat germ, aged cheese, soybeans.
Bottom line
Magnesium L-Threonate (evidence B, safety 5/5) matches the evidence base of Spermidine (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 Spermidine if
Spermidine is the better fit when your goal aligns with its mechanism (Induces autophagy — the cellular self-cleaning process that removes damaged proteins and organelles — through inhibition of histone acetyltransferases) and the dose range (1–5mg) suits your protocol. Half-life is —h.