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Quick Reference Chapter - This is a practical neurotransmitter support guide organized by system. For the underlying mechanisms, see Chapter 21: Tryptophan and the Vagus Nerve and Chapter 22: Wallerian Degeneration.

Generally when your nervous system is dysregulated, your neurotransmitters will be dysregulated as well.

Here is a quick guide on how to improve the neurotransmission affected by infection (per neurofunction).

Favorite Blends

These are combination formulas I use that target multiple neurotransmitter systems simultaneously.

Available on my Fullscript protocol:

• Thrivagen
• Cortisol Manager
• Cognitive Aminos
• DopaBoost
• Memoractiv
• Neurocalm

Serotonin

Serotonin is the neurotransmitter most directly impacted by post-viral illness.

Chronic interferon signaling activates IDO1, which shunts tryptophan into the kynurenine pathway instead of serotonin synthesis.

The result: low serotonin, poor sleep (less melatonin), gut dysmotility (90% of serotonin is in the gut), and depression-like symptoms.

• Lithium (low-dose orotate) - neuroprotective, enhances serotonin release R
• Tryptophan - direct serotonin precursor, take on empty stomach away from other aminos
• Ashwagandha - adaptogen that modulates serotonin receptors and reduces cortisol
• St. John's Wort - serotonin reuptake inhibitor, avoid with SSRIs
• 5-HTP - immediate serotonin precursor (one step closer than tryptophan)
• SAM-e - methyl donor that supports serotonin, dopamine, and norepinephrine synthesis
• Limonene - citrus terpene with anxiolytic and serotonergic properties

Dopamine

Dopamine drives motivation, reward, and executive function.

All of which collapse in post-viral fatigue.

Excitotoxicity from quinolinic acid (kynurenine metabolite) damages dopaminergic neurons, while chronic inflammation suppresses tyrosine hydroxylase activity.

See 256+ Ways To Increase Dopamine Naturally for the full deep-dive.

• Sabroxy - oroxylin A, a powerful dopamine reuptake inhibitor R
• Forskolin - activates adenylate cyclase, increasing cAMP and dopamine release
• Mucuna - natural L-DOPA source, use cautiously, it is a direct dopamine precursor
• Rhodiola - adaptogen that inhibits MAO-B, preserving dopamine levels R
• Theobromine - cacao-derived, mild dopaminergic with vasodilatory effects R

Acetylcholine

Acetylcholine powers memory, learning, and the vagus nerve's anti-inflammatory pathway.

When the vagus nerve is impaired by infection, acetylcholine signaling drops, contributing to brain fog and loss of the cholinergic anti-inflammatory reflex.

See 83+ Ways To Increase Or Decrease Acetylcholine.

• Theanine - increases acetylcholine in the hippocampus R
• Zinc - cofactor for acetylcholine synthesis and release R
• Ginger - acetylcholinesterase inhibitor, preserving existing acetylcholine R
• DHA and fish oil - omega-3s support cholinergic neuron membrane integrity R
• Eggs - whole eggs are the richest dietary source of choline (phosphatidylcholine)

Endorphins

Endorphins are the body's natural painkillers and mood elevators.

Chronic pain, opioid receptor downregulation, and HPA axis dysfunction all reduce endorphin signaling in post-viral patients.

• Cayenne and spicy foods - capsaicin triggers endorphin release via TRPV1 activation
• DLPA - DL-phenylalanine inhibits enkephalinase, preserving endorphins longer
• P5P - active B6, cofactor for endorphin and all neurotransmitter synthesis
• Ascorbyl Palmitate - fat-soluble vitamin C that crosses the blood-brain barrier
• Vitamin C + ALA - synergistic antioxidant pair that supports endorphin pathways
• Low Dose Naltrexone (LDN) - prescription, transiently blocks opioid receptors causing a rebound upregulation of endorphin production

Orexin

Orexin (hypocretin) is produced in the hypothalamus and drives wakefulness, appetite, and energy.

Post-viral patients often have orexin neuron damage from neuroinflammation, contributing to the profound fatigue and hypersomnia that mimics narcolepsy.

• Fasting or Ketosis - ketone bodies (especially beta-hydroxybutyrate) directly stimulate orexin neurons R
• Chewing - mechanical jaw movement activates orexin release (this is why gum can help alertness)
• Ginseng - ginsenosides activate orexin receptors R

BDNF

Brain-Derived Neurotrophic Factor is the primary growth factor for neuronal survival, repair, and plasticity.

After infection-related neuroinflammation and excitotoxicity, BDNF is critical for rebuilding damaged neural circuits.

See BDNF: 140+ Natural Ways To Increase Brain Derived Neurotrophic Factor.

• Beta-Caryophyllene - CB2 agonist that upregulates BDNF R
• Curcumin - restores BDNF levels suppressed by chronic stress R
• Taurine - promotes BDNF expression in the hippocampus
• 7,8-DHF - direct TrkB receptor agonist (mimics BDNF itself) R

GDNF

Glial Cell Line-Derived Neurotrophic Factor supports the survival of dopaminergic and motor neurons.

Especially important for recovering motor function and gut nervous system repair.

See GDNF: What It Is And 67+ Natural Ways To Increase It.

• Curcumin - upregulates GDNF in the gut and brain R
• Luteolin - one of my favorites, potent GDNF inducer and mast cell stabilizer R

NMDA Modulation

Quinolinic acid from the kynurenine pathway over-activates NMDA receptors, causing calcium influx, mitochondrial damage, and excitotoxic neuronal death.

This is a key driver of brain fog, cognitive impairment, and the "buzzing" sensations discussed in Chapter 22.

• Magnesium L-Threonate - the only magnesium form that reliably crosses the blood-brain barrier, blocks NMDA receptors R
• NAC - N-acetylcysteine modulates glutamate/NMDA signaling and replenishes glutathione R
• Noopept - neuropeptide that modulates NMDA receptors and upregulates BDNF/NGF R

GABA

GABA is the brain's primary inhibitory neurotransmitter.

It calms neural firing and counterbalances glutamate excitotoxicity.

In post-viral illness, GABA is often depleted from chronic sympathetic activation and GAD enzyme impairment.

• Holy Basil - adaptogen with direct GABAergic activity
• Valerian - enhances GABA receptor binding, strongest effect at night
• Motherwort - GABAergic herb also used for heart palpitations R
• Ziziphus Jujuba - traditional Chinese sedative targeting GABAa receptors R
• Linalool - lavender/coriander terpene with potent anxiolytic and GABAergic effects

HDAC Inhibition

HDAC inhibition opens up neuroprotective gene expression programs and enhances memory consolidation.

• Butyrate - the most accessible natural HDAC inhibitor, also supports gut-brain axis R
• Ketosis - beta-hydroxybutyrate is itself an HDAC inhibitor

Nogo-A Inhibition

Nogo-A is a myelin-associated protein that actively inhibits axon regrowth and neural plasticity in the adult brain.

After nerve damage from infection (Wallerian degeneration), Nogo-A prevents the regeneration you need.

Inhibiting it allows the brain to rewire.

See Inhibiting Nogo-A For Increased Brain Plasticity.

• Ashwagandha - withanolides inhibit Nogo-A signaling R
• Panax Ginseng - ginsenosides promote axon regrowth by inhibiting Nogo receptor R R
• Hyperbaric Oxygen Therapy (HBOT) - promotes neuroplasticity and myelin repair R

Stay Away From

Not all neurotrophic factors should be upregulated in post-viral illness.

NGF - while it sounds beneficial, NGF upregulation can increase pain sensitization and mast cell degranulation.

In the context of chronic neuroinflammation, more NGF often means more pain, not more healing.

See NGF: What Is Nerve Growth Factor And 60+ Ways To Increase It (And What To Avoid).

Ghrelin mimetics - while ghrelin has some neuroprotective effects, ghrelin mimetics can worsen insulin resistance and increase IGF-1 in contexts where tumor surveillance is already impaired.