Vagus Nerve:
The Key to Health
The vagus nerve connects your brain to nearly every organ in your body. When it stops working properly, the effects show up everywhere — gut issues, anxiety, brain fog, chronic fatigue, poor sleep, and more. This masterclass shows you exactly what's happening and what to do about it.
Most people with chronic symptoms have never been told about the nerve connecting all of them.
You've probably been told your gut issues are one problem, your anxiety is another, your fatigue is a third, and your sleep is something else entirely. You've been referred to different specialists for each one.
What most of those specialists won't tell you is that there is a single nerve — the vagus nerve — that regulates all of those systems simultaneously. When its tone is low, every system it touches starts to struggle. When its tone improves, the effects ripple outward.
This isn't fringe science. Vagus nerve research is one of the fastest-growing areas in neuroscience and clinical medicine. The problem is that most of that research hasn't made it into the consulting room yet — and even less of it has made it into accessible public education.
This masterclass is the version of that education that should have been available years ago.
From the clinic
The Sleep Shift
Nick hadn't slept through the night since his daughter was born — months of broken sleep. He did a vagus nerve stimulation session during the day, not expecting much. That night, he slept straight through until morning. He hadn't done anything else differently.
The Laughing Client
A client came in with chronically low heart rate variability. Nick was monitoring it in real time when he said something that made her laugh. Her HRV jumped from 50 to 80 in seconds. He said something funny again. It went straight back up. Her body was telling them exactly what it needed.
The Parkinson's Tremors
A client in California with Parkinson's disease started transcutaneous auricular vagus nerve stimulation under Nick's guidance. Within a week, his tremors were gone.
What the masterclass covers
Six areas of content, built around the questions Nick gets asked most often in clinic and in his practitioner training programmes.
What the Vagus Nerve Actually Does
The vagus nerve is the longest nerve in the body — and the body never does anything without a reason. It connects to nearly every major organ and gland, modulates your immune response, regulates your heart rate, controls your gut motility, and releases your brain's own calming neurotransmitters.
- →Why 95% of serotonin is built in the gut — and what that means for mood
- →How the vagus nerve controls your inflammatory response
- →The gut-brain axis and why gut health and mental health are inseparable
- →Why low vagal tone means your body can't produce enough serotonin, GABA, or dopamine on its own
The Three Nervous System Responses
Your brain has three options when it perceives threat — and most people are stuck in one of the two less healthy ones. Understanding which state you're in is the first step to changing it.
- →The ventral vagal state: alert without arousal, socially engaged, able to connect
- →The sympathetic state: fight-or-flight, defensive, the default for most people in modern life
- →The dorsal vagal state: shutdown, freeze, immobilisation — the most primitive and most misunderstood
- →Why your nervous system chooses these responses before you're even conscious of it
Signs Your Vagus Nerve Is Struggling
Low vagal tone rarely announces itself clearly. It shows up as a cluster of symptoms that seem unrelated — until you understand the nerve connecting them all.
- →Gut issues: IBS, leaky gut, SIBO, bloating, inflammatory bowel conditions
- →Neurological: brain fog, memory issues, dizziness, chronic fatigue
- →Psychological: anxiety, depression, difficulty connecting with others
- →Endocrine: adrenal fatigue, thyroid dysfunction, blood sugar dysregulation
- →Why neck tension and tight upper trapezius muscles are a direct sign of low vagal tone
How to Assess Your Own Vagal Function
Nick walks you through the same assessments he uses in clinic — adapted so you can apply them yourself at home. No equipment required for most of them.
- →Heart rate variability: what it measures and how to track it
- →The uvula assessment: what the back of your throat tells you about vagal tone
- →Neck muscle tension as a real-time indicator of your autonomic state
- →The neck extension test and what restricted range of motion means neurologically
The Most Effective Vagus Nerve Therapies
From simple daily practices you can start tonight to clinical-level interventions, Nick covers the full spectrum — ranked by effectiveness and accessibility.
- →Humming, singing, and gargling: why they work and how to do them consistently
- →The Basic Reset Exercise: the eye-position technique Nick does every night before sleep
- →Heart-focused breathing and why activating gratitude measurably improves vagal tone
- →Cold exposure: the right protocol, and why 20 seconds hot / 10 seconds cold beats full immersion for most people
- →Transcutaneous auricular vagus nerve stimulation: the clinical-level therapy and when it's appropriate
Conditions Nick Has Treated with Vagus Nerve Therapies
This isn't theoretical. Nick covers the conditions he has treated firsthand in clinic using vagus nerve approaches — including some that surprised him.
- →Migraines, fibromyalgia, chronic fatigue, and brain fog
- →Leaky gut, SIBO, and inflammatory bowel conditions
- →Anxiety, depression, and PTSD
- →Traumatic brain injury and post-concussion syndrome
- →Heart arrhythmias, Parkinson's disease, and stroke recovery
- →Sleep disorders, autism spectrum, and training recovery
✓This is for you if
- →You have gut issues, anxiety, fatigue, or brain fog that haven't resolved with standard approaches
- →You want to understand the nervous system root of your symptoms, not just manage them
- →You've heard about the vagus nerve but want a thorough, clinically grounded explanation
- →You're a health practitioner looking for an accessible introduction to vagus nerve assessment and therapy
- →You want practical techniques you can apply immediately — not just theory
- →You have a condition linked to chronic inflammation, immune dysfunction, or autonomic dysregulation
✗This is not for you if
- →You are looking for a quick fix or a single technique to solve a complex chronic condition
- →You want a substitute for clinical care — this is educational content, not a treatment programme
- →You are not willing to apply what you learn — the techniques only work if you use them consistently
- →You already have a thorough, working understanding of polyvagal theory and vagus nerve assessment
About your instructor
Nick Moss spent seven years in the Australian Army — including deployments to Iraq, Papua New Guinea, and East Timor — before moving into health practice. He trained in manual therapy, kinesiology, and movement before discovering functional neurology and realising it explained everything he had been trying to do with less precise tools.
He has been working with the vagus nerve clinically for over a decade. In that time he has applied vagus nerve therapies to conditions ranging from Parkinson's disease and post-concussion syndrome to anxiety, leaky gut, and chronic fatigue. He has also used them on himself — including recovering from post-concussion syndrome that presented as depression and suicidal ideation in the years after he left the Army.
His brain at 43, he says, is clearer than it was in his early twenties. That is not age. That is what happens when you address the neurological load.
He now trains health practitioners globally through the FNH Foundations and Mastery programmes, and teaches clients through self-directed courses and one-on-one clinical sessions.
Vagus Nerve: The Key to Health
90-minute masterclass · Slide PDF included · Lifetime access
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Common questions
Want to go deeper with your own nervous system?
Book a one-on-one session with Nick to apply vagus nerve assessment and therapy to your specific condition — with clinical guidance rather than self-directed protocols.
Book a Session →Ready to integrate this into your clinical practice?
The FNH Foundations programme is the next step — a structured clinical education in applied functional neurology, built around the same framework Nick uses in clinic.
Explore Practitioner Education →