Last updated: October 2026
The vagus nerve is the longest cranial nerve, running from your brainstem to your heart, lungs and gut. It is the main nerve of the “rest and digest” system, slowing your heart and helping digestion. You can’t switch it on at will, but slow breathing with a longer out-breath reliably increases its activity.
Below: what it does, vagal tone and HRV, which vagus nerve exercises have real evidence (and which are hype), the link with anxiety, and the truth about stimulation devices.
The short version: slow breathing has the strongest evidence. Humming and cold water on the face have small studies behind them. Ear-clip gadgets, “vagus nerve resets” and pressing on your neck have little or none. Medical vagus nerve stimulation is real, but it is a specialist treatment for conditions like epilepsy, not a wellness hack.
What is the vagus nerve?
The vagus nerve is the tenth cranial nerve. Its name comes from the Latin for “wandering”: it leaves the brainstem, runs down each side of the neck and branches out to the throat, heart, lungs and much of the gut.
It is the main component of the parasympathetic nervous system, the “rest and digest” half of your automatic (autonomic) nervous system. A good review describes the vagus nerve as overseeing heart rate, digestion, immune responses and mood, and as one of the main lines of communication between the gut and the brain.
It is also a two-way road: it carries messages up from your organs to your brain. That is part of why a racing heart or churning stomach can feed into how anxious you feel, and why calming the body can calm the mind.
| Where it goes | What it does there |
|---|---|
| Throat and voice box | Swallowing, the gag reflex and the muscles of speech |
| Heart | Acts as a brake, slowing the resting heart rate |
| Lungs | Helps control airway size and passes breathing signals to the brain |
| Stomach and gut | Supports digestion and gut movement, and reports gut signals to the brain |
| Immune system | Involved in calming inflammatory responses (an active research area) |
For the bigger picture of how the two halves of the nervous system balance each other, see our guide to nervous system regulation.
Vagal tone and heart rate variability (HRV)
“Vagal tone” means how much steady influence the vagus nerve has on your body, especially your heart. You can’t measure it directly at home, so researchers use a stand-in: heart rate variability, or HRV.
Your heart doesn’t beat like a metronome. It speeds up slightly as you breathe in and slows as you breathe out, and the vagus nerve drives much of that slowing. HRV measures this beat-to-beat variation. Higher resting HRV is generally linked with a more flexible stress response, which is why fitness watches now report it.
Before you chase a number:
- HRV is an imperfect proxy. It is influenced by breathing rate, age, fitness, alcohol, illness, sleep and even posture, not just the vagus nerve.
- Compare yourself with yourself. A “normal” HRV varies hugely between people. Your own trend over weeks matters more than a single reading.
- Watches differ. Consumer devices use different methods, so numbers from two brands aren’t directly comparable.
If you run or train and track readiness scores, our guide to HRV, sleep and recovery for runners goes deeper.
How to stimulate the vagus nerve: what the evidence says
Strictly, you can’t “stimulate” the vagus nerve the way a medical implant does. What you can do is shift your body towards its rest-and-digest state, which shows up as higher vagally mediated HRV. Here is how the popular methods stack up.
| Method | Evidence | What we know |
|---|---|---|
| Slow breathing (about 6 breaths a minute) | Strong | A meta-analysis of 223 studies found HRV rises during, straight after and over weeks of practice |
| Longer out-breath, physiological sigh | Good | Builds on the same breathing effect; heart rate naturally slows on the out-breath |
| Humming (bhramari breathing) | Early | A small pilot (16 adults) found humming raised HRV about as much as slow breathing |
| Cold water on the face or neck | Early | A lab trial in 61 adults found cold on the side of the neck raised HRV and lowered heart rate |
| Yoga and meditation | Moderate | Likely works largely through slower breathing |
| Singing, chanting, gargling | Weak | Plausible (they slow and lengthen breathing) but little direct research |
| Neck or ear massage, “vagus nerve points” | Very weak | No good evidence; the nerve lies deep in the neck |
| Consumer ear or neck devices | Mixed | Pooled trials found no effect on HRV versus sham (see below) |
1. Slow breathing: the best-evidenced option
This is the one to start with. A 2022 systematic review and meta-analysis pooled 223 studies and found that voluntary slow breathing increased vagally mediated HRV while people did it, immediately after a single session, and after multi-week programmes. The authors described it as low-tech and low-cost, with few side effects expected.
The sweet spot for most people is around 5 to 6 breaths a minute: for example, in for 4 seconds and out for 6. Box breathing is a good structured alternative if counting helps you focus.
2. Humming
Humming is a popular “vagus nerve hack” with a little research behind it. A 2025 pilot study compared slow-paced breathing with bhramari (humming bee) breathing in 16 healthy adults and found both raised HRV and relaxation scores, with no real difference between them. That suggests humming works mostly because it forces a long, slow out-breath. Treat the evidence as early.
3. Cold water on your face
Cold on the face triggers the diving reflex, which slows the heart through the vagus nerve. In a randomised lab trial, 61 healthy adults had a cold probe applied to the neck, cheek and forearm; cold on the side of the neck produced the clearest rise in HRV and drop in heart rate. A cool flannel on your cheeks and neck is a gentle way to try this. Full cold showers and ice baths are a different, much bigger stress on the body: see our guide to cold showers and the safety section below.
4. Yoga, meditation and body-based relaxation
Yoga and meditation are often linked with higher vagal tone, and reviews suggest that is largely because they slow the breath. If sitting still is hard, guided practices like yoga nidra or simple mindfulness for beginners are easy ways in.
5. The everyday basics
Regular movement, enough sleep, less alcohol and time with people you feel safe with all support a calmer baseline. None is a quick hack. For practical ideas, see how to relieve stress.
A 5-minute vagus nerve exercise routine
This combines the methods with the best evidence. Do it sitting or lying down, once or twice a day, or whenever you feel wound up.
- Settle (30 seconds). Sit comfortably, drop your shoulders and unclench your jaw. Breathe normally and notice the breath.
- Slow breathing (2 minutes). Breathe in through your nose for 4 seconds, then out slowly through pursed lips for 6 seconds. That is 6 breaths a minute.
- Hum (1 minute). Breathe in through your nose, then hum gently on the out-breath for as long as is comfortable. Feel the vibration in your face and chest.
- Physiological sigh (3 rounds). Two short in-breaths through the nose, then one long, slow out-breath through the mouth.
- Cool down (optional, 30 seconds). Splash cool (not icy) water on your face or hold a cool flannel to your cheeks and the sides of your neck.
If you feel light-headed at any point, stop and breathe normally. Slow breathing should feel easy, not effortful.
Is a “vagus nerve reset” real?
Not in the way social media suggests. Videos promising to “reset your vagus nerve” in 30 seconds by tilting your head, pressing behind your ears or rolling your eyes make it sound like a switch you can flip. There is no evidence that any single movement resets the nerve, and it doesn’t need resetting in healthy people.
What these routines usually do is make you stop, slow down and breathe out for longer. That can genuinely help you feel calmer in the moment, and that is worth having. It just isn’t a nerve reset.
A lot of the online language also comes from “polyvagal theory”, which describes separate vagal pathways for safety, fight-or-flight and shutdown. It is popular in therapy and wellness circles, but its basic premises have been strongly challenged by researchers, and they shouldn’t be treated as settled science. The practical advice (feeling safe, slowing your breathing, connecting with people) is sound regardless of the theory.
The vagus nerve and anxiety
There is a real link, but it is easy to overstate. A meta-analysis of 36 studies, including 2,086 people with an anxiety disorder and 2,294 controls, found that anxiety disorders were associated with lower resting HRV, with a small-to-moderate effect. Panic disorder, PTSD, generalised anxiety and social anxiety all showed the pattern.
That is an association, not proof that a “weak vagus nerve” causes anxiety. Long-term stress, poor sleep and low fitness can all lower HRV and raise anxiety at the same time.
Where the vagus nerve is genuinely useful is in the moment. Anxiety speeds up your breathing and heart; a slow, long out-breath works the brake. That is why breathing techniques are a standard part of how to stop a panic attack. Many physical anxiety symptoms, like a tight chest, dizziness or a churning stomach, involve the same body systems the vagus nerve helps regulate. If you often feel overstimulated or wired, the routine above is a good place to start.
Breathing exercises support treatment rather than replace it. If anxiety is affecting your daily life, see your GP or refer yourself to NHS Talking Therapies. Our guide on how to deal with anxiety covers the full range of options, and high-functioning anxiety covers the kind that hides behind a busy life.
Signs of vagus nerve problems
Online lists of “vagus nerve dysfunction symptoms” often include almost everything: anxiety, fatigue, brain fog, bloating. These have many causes and aren’t a reliable sign of a nerve problem. Genuine vagus nerve problems are uncommon and are diagnosed by doctors. Situations where the vagus nerve can be involved include:
- Fainting (vasovagal syncope). The most common one. A sudden, strong vagal response drops your heart rate and blood pressure and you pass out briefly. The NHS lists triggers such as being too hot, standing up too quickly, being very upset or being in severe pain.
- Gastroparesis. A condition where the stomach empties too slowly, causing feeling full quickly, nausea and vomiting. The NHS describes it as a problem with the nerves and muscles of the stomach, and it can be a complication of diabetes or some types of surgery.
- Voice or swallowing changes. Hoarseness or difficulty swallowing can sometimes follow damage to vagal branches, for example after neck or chest surgery.
See a GP if you faint, have ongoing dizziness, a hoarse voice for more than a few weeks, difficulty swallowing, or repeated vomiting. Don’t try to self-diagnose a “vagus nerve problem” from a checklist. For a broader look at what stress does to the body, see our guide to stress symptoms.
Vagus nerve stimulation devices: medical vs consumer
“Vagus nerve stimulation” (VNS) means two very different things, and adverts often blur them.
| Medical VNS | Consumer gadgets | |
|---|---|---|
| What it is | An implant under the skin of the chest with a wire to the vagus nerve in the neck, or a prescribed handheld device | Ear clips, neck pads and headphones that send a mild current through the skin |
| Used for | Hard-to-control epilepsy; cluster headache (handheld gammaCore); treatment-resistant depression under special arrangements | Marketed for stress, sleep and relaxation |
| Who decides | A specialist team | You, at the checkout |
| Evidence | Assessed by NICE, with stated limits | Early and mixed |
Medical VNS in the UK
- Epilepsy: the NHS lists an implanted device in the chest as one of the less common treatments when medicines don’t control seizures. NICE notes there is no long-term robust evidence and that it is not risk-free, but sees no reason to stop it for people with few other options.
- Cluster headache: NICE supports a handheld, non-invasive vagus nerve stimulator called gammaCore, which reduces the frequency and intensity of attacks for some people.
- Depression: NICE says implanted VNS for treatment-resistant depression raises no major safety concerns but has frequent side effects, and efficacy evidence is limited in quality, so it is only used with special arrangements.
Consumer ear and neck devices
Most consumer gadgets use transcutaneous auricular VNS (taVNS), stimulating a branch of the vagus nerve in the outer ear. Research is active, but the results so far are underwhelming for the claims made. A living meta-analysis of 16 sham-controlled studies in healthy people found strong evidence that taVNS did not change vagally mediated HRV compared with a sham device.
That doesn’t mean nobody feels calmer using one. But a device costing hundreds of pounds has less evidence behind it than five minutes of slow breathing, which is free. If you have a heart condition, a pacemaker or other implant, epilepsy, or are pregnant, speak to your GP before using any electrical stimulation device.
Safety: fainting and cold water
Gentle breathing and humming suit almost everyone. Two areas need more care.
Feeling faint
Very strong vagal responses can make you faint. If you feel light-headed, sweaty, sick or your vision changes, the NHS advises lying down with your legs raised, or sitting with your head lowered between your knees. See a GP if you have fainted. Call 999 if someone faints during exercise or while lying down, has chest pain or palpitations, doesn’t come round within a minute, or has a seizure.
Cold water
Sudden immersion in cold water triggers two opposing reflexes at once: the cold shock response, which speeds the heart, and the diving response, which slows it. Researchers at King’s College London have proposed that this “autonomic conflict” can cause dangerous heart rhythm problems in vulnerable people. A splash of cool water on the face is very different from plunging into an ice bath or open water. If you have a heart condition, high blood pressure, or have ever fainted, check with your GP before cold plunges, and never swim in cold open water alone.
Where supplements fit
No supplement stimulates the vagus nerve, and you should be wary of any product that claims to. What helps most is free: slower breathing, better sleep, movement and less caffeine and alcohol.
If you want something to anchor a calmer evening routine, our Magnesium Glycinate Sleep Complex is a caffeine-free berry drink with magnesium bisglycinate, L-theanine and chamomile. Magnesium contributes to the normal functioning of the nervous system and to normal psychological function. Read more in magnesium for anxiety.
Some people also take our Flow CBD Oil, with ashwagandha and maca, as part of their day. CBD isn’t a treatment for anxiety and there’s no evidence it acts on the vagus nerve. The FSA’s 10mg a day figure is precautionary advice rather than a legal limit, set while longer-term safety research continues. At Evopure we think it is a very cautious figure, and many adults use more. If you go above it, increase slowly, and check with your GP or pharmacist first if you take any medication. Our products are for adults only, and we don’t recommend them during pregnancy or breastfeeding.
FAQs
What does the vagus nerve do?
It is the main nerve of the rest-and-digest system. It slows the heart, supports digestion and swallowing, and carries information from your heart, lungs and gut back to your brain.
How do I stimulate my vagus nerve?
Slow breathing with a longer out-breath, at around 6 breaths a minute, has the best evidence. Humming and cool water on the face have smaller studies behind them.
How do you reset your vagus nerve?
There is no evidence that any movement resets the vagus nerve. Popular reset routines mainly help because they make you stop and breathe out slowly, which can genuinely calm you.
Can anxiety affect the vagus nerve?
People with anxiety disorders tend to have lower heart rate variability, a marker of vagal activity. This is a link, not proof of cause. Slow breathing can help calm the body during anxious moments.
What are the signs of vagus nerve problems?
Real problems are uncommon. They include fainting spells, slow stomach emptying (gastroparesis) and voice or swallowing changes. See a GP if you faint, feel dizzy often or struggle to swallow.
Do vagus nerve stimulator devices work?
Medical VNS is used on the NHS for some people with epilepsy and cluster headache. Evidence for consumer ear devices is mixed, and a meta-analysis found no effect on HRV compared with sham.
Sources
- Breit S et al (2018). Vagus nerve as modulator of the brain-gut axis in psychiatric and inflammatory disorders. Frontiers in Psychiatry.
- Laborde S et al (2022). Effects of voluntary slow breathing on heart rate and heart rate variability: a systematic review and meta-analysis. Neuroscience and Biobehavioral Reviews.
- Woo M, Kim T (2025). Effects of slow-paced breathing and humming breathing on heart rate variability and affect: a pilot investigation. Physiology and Behavior.
- Jungmann M et al (2018). Effects of cold stimulation on cardiac-vagal activation in healthy participants: randomized controlled trial. JMIR Formative Research.
- Chalmers JA et al (2014). Anxiety disorders are associated with reduced heart rate variability: a meta-analysis. Frontiers in Psychiatry.
- Wolf V et al (2021). Does transcutaneous auricular vagus nerve stimulation affect vagally mediated heart rate variability? A living and interactive Bayesian meta-analysis. Psychophysiology.
- Grossman P (2023). Fundamental challenges and likely refutations of the five basic premises of the polyvagal theory. Biological Psychology.
- Shattock MJ, Tipton MJ (2012). ‘Autonomic conflict’: a different way to die during cold water immersion? Journal of Physiology.
- NICE (2020). Implanted vagus nerve stimulation for treatment-resistant depression.
- NICE (2019). gammaCore for cluster headache.
- NICE (2022). Epilepsies in children, young people and adults (NG217).
- NHS. Epilepsy.
- NHS. Fainting.
- NHS. Gastroparesis.
This guide is general information, not medical advice. Evopure makes the Magnesium Glycinate Sleep Complex and Flow CBD Oil.
