Vagus nerve stimulation (tVNS) – which device should you choose?
Transcutaneous auricular vagus nerve stimulation (tVNS) is a non-invasive procedure using an electrode placed in the ear. It was developed to activate the parasympathetic (“rest-and-digest”) nervous system without a surgical procedure. A mild electrical impulse delivered through the skin of the outer ear stimulates the auricular branch of the nervus vagus. This may affect autonomic nervous system balance, heart rate variability (HRV), stress regulation and relaxation. The treatment does not require an implant and can be used at home while sitting or lying down.
Which one should you choose?
Three devices, three different focuses: Nurosym is the tVNS device with the most extensive clinical research; ZenoWell Vita supports sleep, stress relief and everyday recovery; ZenoWell Luna Plus also offers pain and headache relief modes, as well as features that can be added through the free mobile app (digestive support, concentration, AI Coach). We compare them in detail in the guide below the products.
Neuromodulation device. Stimulates parasympathetic nervous system function via vagus nerve stimulation (tVNS).
Vagus nerve stimulator with three modes: Sleep – supports falling asleep. Relax – stress relief. Medit – meditation.
Vagus nerve stimulator. Four basic modes: Sleep – supports falling asleep. Relax – stress relief. Medit – meditation. Relief – relief from pain and headaches.
Free mobile app with 2 additional modes: Digest – supports digestion. Focus – supports concentration. AI Coach supports optimal use.
How does tVNS work?
A sensory branch of the nervus vagus (ramus auricularis) supplies part of the outer ear, usually the cymba conchae. A mildly perceptible electrical impulse delivered through an electrode placed there stimulates this nerve, reaching the vagal pathways through the skin without an implant. The aim is to support the balance between the parasympathetic and sympathetic nervous systems – the “rest-and-digest” state associated with rest, recovery and returning to a calmer state after stress.
The most commonly studied measurable outcome is heart rate variability (HRV), which is used as one indicator of autonomic nervous system function. The effect of treatment can vary from person to person, and the results experienced may also depend on the programme used, treatment duration and regularity.
Which device should you choose?
All three devices provide tVNS through the outer ear and are designed for home use, but each is optimised for different needs. When choosing, first consider your main aim: are you looking for the most extensively researched option, focused on autonomic nervous system balance, or a device with several modes that supports sleep and stress relief (as well as pain relief) and can be expanded with a mobile app?
| Device | Main focus | Who is it for? |
|---|---|---|
| Nurosym | Autonomic nervous system balance and HRV; the tVNS device with the most extensive clinical research. | For anyone looking for the most extensively studied single-channel device as a complementary approach, with a focus on autonomic regulation. |
| ZenoWell Vita | Sleep, stress relief and recovery, with Sleep, Relax and Medit modes. | For anyone primarily looking to support more restful sleep, stress management and everyday relaxation with a simple, standalone device. |
| ZenoWell Luna Plus | Vita modes plus a pain and headache relief mode (Relief); expandable with the free mobile app (digestion, concentration, AI Coach); includes a ZenoBand Mobi wristband. | For anyone looking for the widest range of modes and the extra features of the mobile app, including a pain relief mode alongside relaxation. |
The difference between ZenoWell Vita and Luna Plus
The two ZenoWell devices work on the same principle. Vita offers three modes (Sleep – falling asleep, Relax – stress relief, Medit – meditation) and works on its own, without a mobile phone. Luna Plus adds a fourth mode, Relief (for pain and headache relief), and can be expanded with two additional modes – Focus (concentration) and Digest (calm after eating) – using the free Zeno mobile app (iOS/Android, Bluetooth). The app’s AI Coach suggests a mode based on logged data (it is not a diagnostic tool), and a ZenoBand Mobi wristband is also included. The four basic modes work without the app.
What about Nurosym?
Nurosym is one of the most extensively studied tVNS devices. Research on it typically focuses on autonomic nervous system regulation and HRV. If your main aim is to use the best-documented device as a complementary approach, Nurosym is worth considering. (The device may be temporarily out of stock; check the product page for current availability.)
What do we know about the evidence?
There is moderate evidence for some applications of tVNS, while research in other areas is still developing. The evidence is not equally strong for every complaint or mode, and individual responses may vary. These devices should be considered a complement to established medical treatment, not a replacement for it. If you have persistent symptoms or take medication, speak to your doctor before use.
Before you start – when should you NOT use it?
tVNS is well tolerated by most adults, but it should be avoided in certain situations or used only after prior medical advice:
- Implanted pacemaker, ICD (defibrillator) or other neurostimulator – use only with approval from a cardiologist or electrophysiologist.
- Severe heart rhythm disorder or serious cardiovascular condition.
- Low blood pressure (vagus nerve activation may lower it further).
- Pregnancy.
- Cochlear (inner ear) implant.
- Recent injury, inflammation or infection of the outer ear at the electrode site.
For more details, read our guides on contraindications to electrical treatment and implants. If you are unsure, consult your doctor before use!
Frequently asked questions
No. The impulse feels like a mild tingling or tickling sensation through the skin of the outer ear. You can gradually adjust the intensity to a comfortable, well-tolerated level – the aim is not to cause pain, but to provide clear stimulation that is only mildly perceptible.
If you mainly want to support sleep, stress relief and relaxation with a simple device that works on its own, ZenoWell Vita is enough. If you also want the pain and headache relief mode (Relief), the extra features in the mobile app (Focus, Digest, AI Coach) and the included ZenoBand Mobi wristband, ZenoWell Luna Plus offers more.
Nurosym is one of the most extensively studied tVNS devices, with research typically focusing on autonomic nervous system regulation and HRV. The ZenoWell devices focus on everyday use, with several pre-set modes (sleep, relaxation, meditation, and, for Luna Plus, pain relief and a mobile app). The choice depends on whether you are looking for the best-documented device or the convenience of multiple functions and pre-set programmes.
No. The four basic modes (Sleep, Relax, Medit, Relief) work without the free Zeno app. The app adds two further modes (Focus, Digest), AI Coach suggestions, a treatment log and a combined view of ZenoBand Mobi data. The app supports major world languages but is not currently available in Hungarian.
If you have an implanted pacemaker, ICD or other neurostimulator, use it only with approval from a cardiologist or electrophysiologist. It should also be avoided, or requires medical advice, in cases of severe heart rhythm disorder, low blood pressure, pregnancy, a cochlear implant, or a recent injury, inflammation or infection of the outer ear. If you are unsure, consult your doctor before use.
Learn more about vagus nerve stimulation
If you would like to learn more about how the vagus nerve and parasympathetic nervous system work, and about the background to tVNS, read our articles:
