Vagus Nerve Stimulation Devices: Do They Work?

What it claims

The vagus nerve runs from the brain to the heart, lungs and gut and helps control the body's "rest and digest" state. Consumer devices promise to "switch on" this calming system in a few minutes a day, easing stress and anxiety, improving sleep, raising heart rate variability (HRV, a measure of heart rhythm flexibility) and even helping inflammation and gut health.

What the evidence shows

Medical versus consumer devices

Implanted vagus nerve stimulators, wired to the nerve in the neck during surgery, are used for hard-to-treat epilepsy and depression. A handheld neck device, gammaCore, is supported by NICE for cluster headache. These are medical treatments for specific conditions, with clinical trials behind them.

Consumer devices are different. Pulsetto sends a current through the skin of the neck. Nurosym clips onto the tragus, the small flap at the front of the ear, where a branch of the vagus nerve sits close to the skin. Sensate uses vibration on the chest and no electrical current at all.

What ear-based research shows

Most research is on transcutaneous auricular vagus nerve stimulation (taVNS), the ear approach. A 2022 review found adverse events were no more common than with sham stimulation; ear pain, headache and tingling were the most reported. A 2025 meta-analysis of six insomnia studies found better sleep scores, but rated the evidence low to very low. Small sham-controlled US trials of tragus stimulation found less heart rate rise on standing in POTS and lower atrial fibrillation burden in AF. These are promising signals in specific conditions, not proof of everyday stress relief.

Does it change HRV?

Many devices sell themselves on HRV. A living meta-analysis of 16 sham-controlled studies in healthy people found strong evidence that a single session of ear stimulation does not change vagal HRV compared with sham. So a rise on your watch after a session is likely due to rest and slow breathing.

What about neck and chest devices?

We found no published, independent, sham-controlled trial of Pulsetto or Sensate. That does not mean they do nothing, but any calm you feel may come from lying still, breathing slowly and expecting to relax, which are useful in their own right.

Who might reasonably try it

• Healthy adults who want a structured wind-down routine and can afford it.
• People with a diagnosed condition such as POTS who are interested in ear stimulation and can discuss it with their specialist.

Who should be careful

• Pacemakers, defibrillators or other implants: avoid electrical devices unless your specialist agrees.
• Heart rhythm problems, fainting or a slow heartbeat: stimulating the vagus nerve can slow the heart.
• Epilepsy or pregnancy: check with your doctor first.
• Anyone using a device instead of care: these devices should not replace therapy, CBT for insomnia or prescribed medicine.

If you want to try it: what to look for

• Ear-based stimulation if you want the method with the most research.
• Medical device status (UKCA or CE marked as a medical device) rather than "wellness" only.
• Published sham-controlled trials of that device, not just general vagus nerve research.
• A long return window, so you can stop if it does nothing for you.
• Full running costs, including gels, earpieces and app subscriptions.

Free ways to engage the "rest and digest" system

Many of the effects people hope for from a device can be practised without one. Slow breathing at around six breaths a minute, with a longer out-breath than in-breath, reliably increases HRV during the exercise in studies. Humming, singing, gentle yoga and cold water on the face also stimulate vagal reflexes. These cost nothing and carry very little risk, so they are a sensible first step before spending hundreds of pounds on a gadget.

How to judge a device's claims

• Ask for the trial: a sham-controlled study of that specific device, published in a peer-reviewed journal, not a brand white paper.
• Check the outcome: a change in HRV is not the same as feeling less anxious or sleeping better.
• Look for independent researchers: studies run or paid for by the company are useful but need confirming.
• Be wary of disease claims: a wellness device should not claim to treat anxiety, depression or inflammation.

Are there side effects?

For ear-based stimulation, reviews report mild, short-lived effects such as ear pain, skin redness, headache and tingling. Neck devices can cause skin irritation under the electrodes. Because the vagus nerve slows the heart, there is a theoretical risk of dizziness or a slow pulse, which is why people with heart rhythm problems should check first. Stop if you feel faint and speak to your GP.

Our picks at a glance

How we chose

We included devices sold to UK buyers with GBP prices, and judged them on how close their method is to published sham-controlled research, regulatory status and return terms. We did not include devices without a UK store.

Nurosym

An ear-clip device using the tragus approach studied in small sham-controlled trials, sold as a CE-marked medical device. Caveat: the trials are small and in specific conditions, and at £599 it is a big outlay for an uncertain benefit.

Pulsetto Vagus Nerve Stimulation Device

The best-known neck device in the UK, with app-guided sessions of a few minutes. Caveat: we found no published sham-controlled trial of the device, and gels and app features add ongoing costs.

Sensate 2

A chest-worn device that pairs gentle vibration with soundscapes and has a 90-day trial. Caveat: it does not deliver electrical vagus nerve stimulation, and we found no independent sham-controlled trial.

Bottom line

Vagus nerve stimulation is a real medical treatment for some conditions, but home devices for stress and sleep are still unproven. Ear-based devices have the most science and look low risk for most healthy adults. If you buy one, treat it as a relaxation tool, check the return policy, and speak to your GP if stress, anxiety or sleep problems are affecting daily life.