How your brain's chemicals shape attention, mood, memory & focus — and the supplements that support each system. A single-page guide.
Every mental state is a balance — not one chemical, but a ratio between several. Two chemicals set your baseline excitability; the rest tune specific circuits on top.
Glutamate — the brain's main excitatory signal. Drives learning and the synaptic strengthening that encodes memory.
GABA — the main inhibitory signal. Quiets neural activity to produce calm and reduce anxiety.
Dopamine, serotonin, etc. tune specific circuits. Hormones like cortisol set the overall emotional weather.
Baseline set by Glutamate ⇄ GABA → tuned by dopamine · norepinephrine · serotonin · acetylcholine → shaped by cortisol · oxytocin · BDNF → your mental state
The core neurotransmitters and modulators. Notice that most work on an inverted-U — too little and too much both cause problems.
Less about pleasure, more about wanting and pursuing. Powers goal-directed focus, working memory and movement.
Your "vigilance and engagement" chemical. Sharpens attention and drives fight-or-flight with adrenaline.
Governs mood stability, sleep, appetite and a sense of "enough." ~90% is made in the gut.
The brain's main inhibitory signal. Target of alcohol, benzodiazepines and many sleep aids.
The main excitatory signal and workhorse of learning. Drives the synaptic strengthening that stores memories.
Most tied to memory sharpness and forming new memories. Its decline is central to Alzheimer's.
Useful in short bursts. Chronically high cortisol shrinks the hippocampus, impairs memory and fuels anxiety.
Promotes neuron growth, survival and rewiring. The keystone of long-term learning, mood and resilience.
Released through connection, touch and trust. Lowers stress and anxiety and builds social safety.
Your internal opioids. Released by exercise, laughter and stress — the source of the "runner's high."
Sets your sleep clock — which indirectly governs memory consolidation and overnight clearing of brain waste.
The states you asked about, and the chemical mix behind each. ▲ higher, ▼ lower, ● key player.
What can support each system — colour-coded by honest evidence tier. Filter below. This is educational, not medical advice.
Neuronal membranes, mood, memory.
Mood & cognition; deficiency is common.
Glycinate/threonate — calm, sleep, memory.
Cofactors for making every neurotransmitter.
Needed for dopamine synthesis.
Precursor; helps focus under stress.
Adaptogen; drive, less fatigue.
Boosts dopamine signalling & alertness.
Powerful; doctor-supervised only.
The classic stack: calm, jitter-free focus.
Norepinephrine drug for ADHD.
Precursors. Don't mix with antidepressants.
Surprisingly good for mild low mood.
Works, but major drug interactions.
Frontline prescription antidepressants.
Good evidence for lowering stress & cortisol.
Relaxed alertness.
Support calm & sleep.
Effective but habit-forming; short-term only.
Raise acetylcholine; cognitive support.
Improves memory over weeks of use.
May support nerve growth factor.
Potent — cycle, don't use daily.
Cheap, safe; helps under stress/sleep loss.
Supports plasticity & mood.
Needs a bioavailable form.
Promising for nerve growth.
Best-evidenced for chronic stress.
Adaptogen for stress & fatigue.
Supports a calmer stress response.
Decades of use, mixed evidence.
Stronger, less studied.
Circulation/memory, modest effect.
Mild cognitive & energy support.
Disclaimer: This is an educational summary, not medical advice. Evidence quality varies and individual needs differ. Talk to a physician before starting anything beyond basic nutrients — especially if you take other medications.