Who is the ZenoWell Luna for?
If you experience headaches 4–15 days per month, or you’re among those for whom prophylactic medications cause side effects or lose effectiveness – the Luna’s Relief mode can be used as an adjunct solution. Consistent twice-daily use for 4 weeks can, according to research, favorably influence the number and intensity of headache days. The effect is NOT immediate: the literature uses 4-week study periods.
Hormonal-cycle related headache is one of the hardest types to treat, since drug prophylaxis often brings unwanted side effects. Used twice daily as a non-invasive adjunct throughout the cycle, the Relief mode can support regulation of pain pathways. As with all taVNS treatments, consistency matters more than single uses.
If you’ve tried many solutions – sleep hygiene, herbal tea, short-term hypnotics – but chronic insomnia is still part of your daily life, the Luna Sleep mode may produce measurable improvements in Pittsburgh Sleep Quality Index scores according to a 2024 JAMA Network Open RCT, with daily use over 8 weeks. The Luna’s longer battery life allows you to use Sleep for falling asleep and Relief as well if you wake with a headache at night.
Persistent sympathetic overactivity is a common underlying factor behind the combination of tension-type headache, muscle tension and sleep disturbance. Daytime use of the Relax mode can support activation of the "rest-and-digest" response – heart rate may decrease and heart rate variability (HRV) may improve. Regular use has been shown to positively influence gastrointestinal function as well.
Vagal tone plays a role in regulating inflammatory responses via the cholinergic anti-inflammatory pathway. In chronic joint complaints, muscle pain or overtraining symptoms, the Relief and Medit modes can be used as adjuncts alongside prescribed physiotherapy, exercise therapy and medications. It DOES NOT replace rheumatological care!
Why might vagus nerve stimulation work for headaches?
Several mechanisms may play a role in migraine and tension-type headache: activation of the trigeminovascular system, central sensitization, neuroinflammation and imbalance of the autonomic nervous system. The auricular branch of the vagus nerve that Luna stimulates is directly connected to these pathways – via the nucleus tractus solitarii it can influence the function of the periaqueductal gray (PAG), the locus coeruleus and thalamocortical networks.
fMRI studies (Zhang et al., 2020) showed that after 4 weeks of taVNS treatment in migraine patients not only did monthly headache days and pain intensity decrease, but measurable modulation of thalamocortical connections was observed. This structural neuromodulation explains why the effect is cumulative.
Research indicates that taVNS can:
- Modulate ascending pain pathways
- Support the cholinergic anti-inflammatory pathway (CAIP)
- Favorably influence heart rate variability (HRV)
- Activate the parasympathetic "rest-and-digest" response
- Support regulation of sleep–wake cycles via the locus coeruleus network
Moist contact is necessary for stable electrical conduction between the metal electrode and the skin of the ear. Conductive gel provides a more stable and less drying contact than plain water. Regular users should consider purchasing replacement gel.
After each use wipe the electrodes with a soft, dry cloth. Once a week perform a deeper disinfection with an alcohol wipe. NEVER wash the main unit under running water! The silicone fitting can be cleaned with warm, soapy water.
Frequently asked questions about the Luna
If your main concern is sleep, stress management or daily relaxation, the Vita with 3 modes is a good choice. If, however, headache, migraine, chronic pain are also in the picture, or you want one device to cover multiple issues – Luna is recommended because it includes the fourth Relief mode. Additionally, the Luna’s battery lasts twice as long and enables 20+ sessions from a single charge.
During an acute migraine episode some users report pain relief after a 20-minute Relief session, but this varies significantly between individuals. The preventive effect – a reduction in monthly headache days – typically requires at least 4 weeks of twice-daily use according to the literature. Straube et al. (2015) used a 3-month study period. The effect is cumulative: it does not develop without regular use.
The Luna works non-invasively and independently of drugs, so it does not have direct drug interactions. However, DO NOT change or stop prophylactic or acute migraine medications prescribed by your neurologist because you bought the device. Luna is an adjunct tool, not a replacement for specialist care. Consult your treating neurologist if you want to use it in combination.
More than 65% of clinical trials used left-sided stimulation – this is the standard protocol in the literature. The right vagus nerve has stronger connections to the cardiac conduction system, so for safety reasons non-invasive taVNS treatments prefer the left side. A right-side earplug can be purchased separately, but use only one at a time!
The Relief mode provides continuous but gentle stimulation – initially you may feel light tingling or pricking that quickly softens into a gentle vibration. If you try it during a migraine attack and experience any worsening (increasing pain, nausea, light sensitivity), stop the treatment immediately. In some patients in the acute phase, taVNS may not be effective – which is why starting treatment between attacks as a preventive approach is recommended.
NO. Pacemaker, ICD, cochlear implant, deep brain stimulator or any implanted electronic device are absolute contraindications. Epilepsy is also a contraindication – interestingly, VNS was originally developed to treat epilepsy (as an implanted device under medical supervision), but unsupervised at-home taVNS is NOT recommended for patients with epilepsy. It should not be used during pregnancy due to lack of clinically validated data.
Based on manufacturer protocols and clinical trials, 1–2 times daily for 20 minutes per session is recommended. For preventive headache use, twice daily (morning + evening) for 4 weeks is the minimum for effect development. The literature does not define a strict maximum safe use, but more than 3–4 sessions per day is not recommended – "more = better" does not apply here.
How to use the Luna – step by step
1
Define your goal and choose the mode
Before sleep → Sleep. Daytime stress → Relax. Meditation, focus → Medit. Headache, chronic pain → Relief. For an acute migraine attack, the Relief mode can bring noticeable relief within 20 minutes for some users, but the true effect builds with twice-daily use over 4 weeks.
2
Prepare the earplug
Moisten the electrode surface of the left earplug with contact gel (or water spray if the gel has run out). Without a moist contact the stimulation will not be effective!
3
Position it in your left ear
The electrodes should contact the cymba concha and cavum concha areas of the ear – this is the auricular branch of the vagus nerve. Poor positioning may make the stimulation uncomfortable or ineffective. Follow the diagrams in the user manual!
4
Start and gradually adjust the intensity
Plug the earplug cable into the device, press and hold the power button for 3 seconds. Start from ZERO intensity, and slowly increase to the level you feel is “strong but not painful.”
5
20 minutes – sync your breathing
The Relax and Medit modes use an intermittent rhythm (4 s on / 4 s off). Breathe with the device: exhale during the pulse, inhale during the pause. The Sleep and Relief modes provide continuous stimulation – here just close your eyes and let it work.
6
Maintain the routine for at least 4 weeks
The effect of taVNS is cumulative. Don’t expect miracles after one or two sessions – but daily 1–2 sessions for 2–4 weeks can already bring noticeable changes. To reduce the number of headache days, the literature recommends at least 4 weeks of twice-daily use.
Technical specifications
| Device type | Transcutaneous auricular vagus nerve stimulator (taVNS) |
| Stimulation modes | 4 pcs – Sleep (continuous, undulating), Relax (intermittent 4/4 s), Medit (intermittent, higher frequency), Relief (continuous, pain-tuned) |
| Recommended session time | 20 minutes / session, 1–2 times daily (for headache prevention 2x daily, min. 4 weeks) |
| Target stimulation area | Left ear – cymba conchae and cavum conchae (auricular branch of the vagus nerve) |
| Intensity control | Continuous, stepless adjustment visible on digital display |
| Battery type | Built-in lithium-polymer, USB-C charging |
| Battery life | Approx. 8 hours continuous use (20+ sessions on one charge – 2x that of the Vita) |
| Connection | Wired earplug electrode (no Bluetooth, no app) |
| Earplug type | Designed for left ear with replaceable silicone fitting |
| Design | Modern, ergonomic, compact design |
| Manufacturer | ZenoWell (Heidelberg, Germany – BrainClos technology background) |
| Warranty | Manufacturer warranty according to applicable EU regulations |
When NOT to use the device?
The Luna is non-invasive, but its use is not recommended in certain conditions and circumstances. The list below should be read carefully before purchase and use:
- Presence of pacemaker, implantable defibrillator (ICD), cochlear implant, deep brain stimulator or any implanted electronic device
- Severe arrhythmia, unstable heart disease, uncontrolled high blood pressure
- Epilepsy, history of seizures – unsupervised at-home taVNS treatment is not recommended
- Pregnancy and breastfeeding (effects on the fetus and breast milk have not been clinically studied)
- Active cancer in the head–neck region, or during the post-treatment recovery period – without prior oncologist consultation
- Injury, inflammation, infection of the left ear, recent ear surgery, skin disease in the stimulation area
- Under 18 years of age (efficacy and safety in children not validated)
- Acute, unexplained headache – for a new, unusually severe headache ALWAYS consult a physician first, the device is not diagnostic
- Do NOT use while driving, operating machinery, or during water activities – the relaxation effect may reduce concentration
- Numb or significantly impaired skin in the ear (appropriate intensity may not be perceived)
Unsure? Consult your treating physician before use, especially if you have a chronic disease, are on migraine prophylaxis, or take regular medication!
Important information
The ZenoWell Luna is a home-use wellness device whose use is non-invasive and generally well tolerated according to the literature. Nevertheless, it DOES NOT replace medical diagnosis, neurological evaluation or specialist migraine prophylaxis. For new, unusually severe or recurring headaches always consult a specialist – diagnosis of chronic migraine and exclusion of possible secondary headache forms is solely a medical competence. The device can be used as a complement to medical treatment. Effects may vary between individuals and, according to research, may develop cumulatively after 2–4 weeks of daily use.
The information in the product description is for informational purposes and does not constitute individualized medical advice. Read the included user manual before use and consult your treating physician if in doubt.
Scientific background – References
Significant evidence has accumulated in the field of transcutaneous auricular vagus nerve stimulation (taVNS) over the past decade, particularly for migraine and insomnia:
- Straube A, Ellrich J, Eren O, et al. (2015). Treatment of chronic migraine with transcutaneous stimulation of the auricular branch of the vagal nerve (auricular t-VNS): a randomized, monocentric clinical trial. The Journal of Headache and Pain, 16:543. PubMed
- Zhang Y, Liu J, Li H, et al. (2021). Transcutaneous auricular vagus nerve stimulation (taVNS) for migraine: an fMRI study. Regional Anesthesia & Pain Medicine, 46(2):145-150. PubMed
- Systematic Review (2023). Management of auricular transcutaneous neuromodulation and electro-acupuncture of the vagus nerve for chronic migraine: a systematic review. Frontiers in Neuroscience. PubMed
- Zhang S, Zhao Y, Qin Z, et al. (2024). Transcutaneous Auricular Vagus Nerve Stimulation for Chronic Insomnia Disorder: A Randomized Clinical Trial. JAMA Network Open, 7(12):e2451217. PubMed
- Systematic Review & Meta-Analysis (2025). Transcutaneous Auricular Vagus Nerve Stimulation in Insomnia: A Systematic Review and Meta-Analysis. Neuromodulation. PubMed
- RCT (2025). Effects of vagal nerve stimulation on pain frequency and intensity in chronic migraine in adults: A randomized controlled trial. PubMed
