Glutamatergic & synaptic plasticity
One of 6 mechanistic pathways to 🧠 Focus, memory & cognition · 10 options
Long-term potentiation — the cellular basis of learning — runs through AMPA and NMDA receptors. Modulating them raises the ceiling on how readily new connections form, and it is also the pathway where excitotoxicity is a real rather than theoretical concern.
Magnesium is a physiological NMDA-receptor blocker, so low magnesium leaves glutamate signalling unopposed — which feels like anxiety and poor recall rather than a deficiency.
Magnesium, RBCVitamin D (25-Hydroxy)hs-CRP (High-Sensitivity C-Reactive Protein)Homocysteine🧠 Brain Fog & Cognition covers these in one panel →
What engages this pathway
Ordered by how directly each one acts on the mechanism above — never by how much trial evidence exists. Each links to its full breakdown with dosing, half-life and vendor.
💉 Sunifiram
An ampakine reported to be far more potent than piracetam in rodent models, acting on AMPA and glycine sites. Essentially no human safety data — the enthusiasm outruns the evidence badly.
💉 Neboglamine
A positive modulator at the NMDA glycine site, developed for schizophrenia. The cognitive-enhancement use is entirely extrapolated from that programme.
💉 Fasoracetam
Upregulates metabotropic glutamate receptors and acts on GABA-B. Trialled in adolescent ADHD with mGluR mutations, which is an unusually specific and mechanistically satisfying use case.
💉 Dihexa
An angiotensin-IV analog acting on the HGF/c-Met pathway, reported to be seven orders of magnitude more potent than BDNF at promoting synaptogenesis in vitro. That number is extraordinary and it is entirely preclinical — no human safety data of any kind exists.
💉 PRL-8-53
A single 1970s human trial showed dramatic improvement in word recall, particularly in poor baseline performers. Never replicated in fifty years, which is itself informative.
💉 P-21
A Cerebrolysin-derived peptide fragment reported to increase neurogenesis and BDNF in animals.
💉 NSI-189
Increases hippocampal neurogenesis and volume in animal models. A human depression trial missed its primary endpoint while showing cognitive improvement on secondary measures — an interesting failure.
💉 9-ME-BC
A beta-carboline that raises dopamine and shows neurotrophic and neuroprotective effects in cell models. Some beta-carbolines have genotoxicity concerns, which deserves more scrutiny than it gets.
🧬 Magnesium L-Threonate
The magnesium form shown to raise brain magnesium specifically, increasing synaptic density in animals and improving cognitive measures in a human trial.
🧬 Lion's Mane
Hericenones and erinacines stimulate NGF synthesis. A Japanese trial showed improved cognitive scores in older adults that reverted after stopping — meaning the effect requires ongoing use.
The other 5 routes to focus, memory & cognition
Pick the pathway that matches where you are actually stuck. An appetite drug does nothing for someone who already undereats.
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Frequently asked questions
Long-term potentiation — the cellular basis of learning — runs through AMPA and NMDA receptors. Modulating them raises the ceiling on how readily new connections form, and it is also the pathway where excitotoxicity is a real rather than theoretical concern.
10 options are mapped to this pathway in the Vault, including Sunifiram, Neboglamine, Fasoracetam, Dihexa. They are grouped by the mechanism they act through rather than ranked by how much trial evidence exists — 2 carry clinical validation and 8 are mechanistic predictions.
Magnesium is a physiological NMDA-receptor blocker, so low magnesium leaves glutamate signalling unopposed — which feels like anxiety and poor recall rather than a deficiency. The markers worth checking are Magnesium, RBC, Vitamin D (25-Hydroxy), hs-CRP (High-Sensitivity C-Reactive Protein), Homocysteine.
Unproven is not the same as ineffective. Of the 10 options on this pathway, 2 have clinical validation and 8 are graded theoretical — meaning the mechanism is sound but the specific human trial has not been run, which is true of a great deal of what works in this space. Nothing on this page is ordered by evidence tier, because sorting by trial count would bury the compounds you came looking for.