Discover the Nervous System Self-Assessment and learn if your energy regulation system needs support
Do You Feel Dizzy or Lightheaded Just Standing Up?
Ask yourself
- Do you feel faint when standing, leaning on walls or counters for balance?
- Do hot showers leave you weak, like gravity is pulling you down?
- Do you avoid standing in lines because you know you’ll feel faint?
If you answered yes, your autonomic nervous system (ANS) may not be regulating blood pressure and circulation correctly.
Physiological Mechanisms:
- Blunted baroreflex sensitivity: The body’s “blood pressure stabilizer” relies on vagal input to adjust heart rate and blood pressure when you stand.
- Vagal underactivity: When the vagus nerve isn’t firing properly, blood pools in the legs instead of circulating efficiently to the brain.
- Sympathetic surge: The body overcompensates with adrenaline, creating dizziness and faintness.
Research shows taVNS can modulate autonomic outflow and improve markers of autonomic balance, including heart rate variability (HRV) and stress reactivity.
Do You Suffer from a Racing Heart and Palpitations?
Ask yourself
- Does your heart pound when you stand up?
- Do you feel like your heart is racing even when you’re at rest?
- Do you get sudden palpitations that leave you anxious and drained?
Physiological Mechanisms:
- Autonomic imbalance: Sympathetic “accelerator” gets stuck on, vagal “brake” isn’t working.
- Reduced vagal tone: Without vagal counterbalance, HR soars abnormally on standing.
- Overactive adrenaline loop: Your heart races to compensate for poor circulation.
Early studies suggest vagal stimulation can reduce sympathetic activity, shifting the nervous system back toward balance.
Do You Crash from Exhaustion After Simple Activities?
Ask yourself
- Do grocery trips or showers leave you wiped out?
- Do you plan your entire day around pacing energy?
- Do even minor exertions trigger a “post-crash” that takes hours or days to recover from?
Physiological Mechanisms:
- Perfusion failure: Poor blood/oxygen delivery to muscles and brain drives extreme fatigue.
- Sympathetic overdrive: Constant stress signaling drains energy reserves.
- Cellular fatigue: Low vagal tone contributes to oxidative stress and poor mitochondrial recovery.
Pilot studies in post-viral fatigue and Long-COVID cohorts suggest taVNS may improve energy levels and recovery tolerance, with larger clinical trials underway.
Is Brain Fog Stealing Your Clarity?
Ask yourself
- Do you forget what you were saying mid-sentence?
- Do you reread the same page but absorb nothing?
- Do you feel detached in conversations, like your mind is underwater?
Physiological Mechanisms:
- Reduced cerebral blood flow: Poor autonomic regulation limits oxygen to the brain.
- Neuroinflammation: Linked to “slowed processing” in patients experiencing.
- Disrupted neurotransmission: Low vagal tone affects dopamine/acetylcholine, impairing focus and motivation.
Clinical research shows taVNS can influence brain networks involved in attention and working memory, with some studies reporting improvements in clarity and focus.
Do You Sleep but Wake Just as Exhausted?
Ask yourself
- Do you spend 8–10 hours in bed but wake feeling unrefreshed?
- Do you feel wired at night but tired all day?
- Do naps fail to restore your energy?
Physiological Mechanisms:
- Chronic stress mode: The ANS fails to switch into deep parasympathetic recovery at night.
- Poor sleep architecture: Fragmented REM/NREM cycles.
- Overnight sympathetic surges: Heart rate spikes during the night keep the body on high alert.
In a randomized clinical trial, taVNS reduced insomnia severity compared with control, suggesting a role in supporting deeper, more restorative sleep.
Is Postural Heart Rate Abnormalities Affecting Your Digestion and Immunity Too?
Ask yourself
- Do you get bloated after meals or feel nauseous when standing after eating?
- Do you catch colds frequently or recover slowly from minor illnesses?
- Do you have unpredictable bowel habits?
Physiological Mechanisms:
- Gut-brain axis disruption: Low vagal tone impairs digestion and gut motility.
- Immune dysregulation: Poor vagal input weakens the anti-inflammatory reflex.
- Systemic inflammation: Contributes to worsened fatigue and symptom flares.
Vagal pathways help regulate both gut and immune balance; taVNS is being studied for potential benefits in motility and immune signaling.
The Missing Piece Your Doctor Never Learned
Here’s what connects all 6 truths: your vagus nerve controls every one of these processes.
- It regulates blood pressure and circulation.
- It helps calm a racing heart.
- It shapes how your body recovers energy.
- It clears brain fog and supports neuroplasticity.
- It helps synchronize restorative sleep cycles.
- It modulates digestion and immune responses.
These findings support the vagus nerve as a central switchboard for recovery. Non-invasive stimulation is actively being studied as a way to help restore this control system.
Discover Nurosym: The Natural Path to Autonomic Balance
Nurosym offers a scientifically studied, drug-free approach to restore energy and stability by targeting your vagus nerve through auricular stimulation.
Why Nurosym Works:
Evidence indicates taVNS can dampen stress-hormone reactivity, modulate autonomic balance, and improve sleep. Pilot studies in post-viral fatigue and Long-COVID cohorts also report encouraging improvements, with larger clinical trials underway.
Instant ANS reset
Begin rebalancing within minutes of use.
Clinically studied
50+ studies exploring autonomic balance, HRV, sleep, fatigue.
Natural & safe
Non-invasive, no drug interactions.
Nurosym is a CE-marked device in the EU and is used under FDA “non-significant risk” designations in U.S. studies.
Endorsed by Leading Autonomic & Recovery Specialists

Anthony Kaveh, MD
Anesthesiologist & Medical Director at Clarus Health
"I wanted to know can we help our patients have an even more sustained relief from an out-of-control sympathetic nervous system. I'm happy to say so far the answer has been yes."

Dr Myro Figura
Anesthesiologist & Chief Medical Officer at HealFast
"(Nurosym) increases the rest and digest side of your nervous system by up to 61% in five minutes and it's a potent reliever for anxious states."

Dr James Gill
Associate Professor at Warwick Medical School & General Practitioner
"I found (publications) with no declared conflict of interest by Leeds University. They demonstrated reduced sympathetic nerve activity. Personally, (with Nurosym) my HRV increased from 40s to 69."

Dr Mikolaj Raszek
Researcher at Merogenomics
"Based on the evidence coming out, it looks as if these devices... appear to be helping big time in terms of Post-Viral Fatigue."

Ashley Ridout
Osteopath & Educator
"I tried this on two patients: a 45-year-old male with chronic neck pain reported better and deeper sleep... A 30-year-old female with headaches noticed improved sleep and reduced pain."

Bryan Johnson
Founder of Braintree, Project Blueprint
"HRV is a pretty significant biomarker for health. It has a clear association with age... HRV training is keeping me low key, chill and calm."
Real Results from Real People
“From Postural Heart Rate Abnormalities to fewer rough days—take it off for a day and I feel the difference.”
– Nurosym user
“After post-viral dysautonomia, I finally got a foothold out of exhaustion.”
– Sarit
“Constant crashes turned into steadier days. The improvement was immediate.”
– Postural Heart Rate Abnormalities sufferer testimonial
Cómo elegir un estimulador del nervio vago
Con la gran variedad de dispositivos disponibles en el mercado, es importante investigar bien y elegir el que mejor se adapte a tus necesidades. Lo más importante es asegurarte de que la intervención que estás considerando haya sido científicamente probada para actuar sobre el nervio vago.
Estos son algunos de los factores clave que hay que tener en cuenta a la hora de tomar una decisión:
- Consult with your health care professional
Antes de comenzar cualquier nueva intervención médica, siempre es recomendable consultar primero con un profesional sanitario. Para la estimulación del nervio vago, elija un neurólogo o especialista que esté familiarizado con los dispositivos de VNS, para que pueda aconsejarle correctamente sobre si le ayudará con sus síntomas específicos. - Compatibilidad con tus síntomas
Los dispositivos VNS están diseñados para mejorar síntomas específicos, como estados depresivos, cansancio crónico, problemas gastrointestinales y confusión mental. Asegúrate de que la estimulación del nervio vago haya sido estudiada y evaluada en cuanto a su eficacia para tus necesidades de salud específicas. Los dispositivos VNS también tienen diferentes ubicaciones de estimulación, como el cuello y la oreja. Sensate, que no es un dispositivo VNS, afirma estimularlo a través del pecho. Sin embargo, Nurosym’s AVNT approach and Gammacore’s approach both have scientific evidence of precise targeting and safety. Other approaches at any location are at best playing the piano out of tune and at worst actively dangerous. - Seguridad y certificación como dispositivo portátil
Muchos dispositivos afirman ser dispositivos VNS y ser seguros, pero es importante evaluar la investigación científica realizada sobre cada dispositivo para comprender su perfil de seguridad. Sensate y Pulsetto afirman que activan el nervio vago, pero no tienen ninguna evidencia científica que lo confirme. Los diferentes métodos de estimulación del nervio vago también están asociados a diferentes efectos secundarios, por lo que es conveniente comprender todos los riesgos antes de comprar. Los dispositivos que han obtenido la certificación Wearable Device son fundamentales, ya que esta certificación requiere rigurosas pruebas de calidad y estudios de seguridad para garantizar que no dañan el sistema nervioso. - Eficacia e investigación
Asegúrese de buscar dispositivos respaldados por investigaciones científicas y, a ser posible, estudios controlados con placebo. Un dispositivo de buena reputación habrá publicado investigaciones que respalden sus afirmaciones. Las pruebas aleatorias controladas con placebo garantizan que los efectos de un dispositivo no se basan en el placebo, lo que da confianza en los beneficios terapéuticos reales del dispositivo. Del mismo modo, los estudios revisados por pares reducen el riesgo de resultados sesgados y demuestran la credibilidad del dispositivo probado.Muchos dispositivos citan investigaciones genéricas sobre la VNS, pero no han realizado ningún estudio de seguridad y eficacia sobre su dispositivo. El hecho de que un dispositivo emita una corriente eléctrica en la zona donde se encuentra el nervio vago no garantiza que active el nervio vago ni que tenga un impacto positivo en él. La mayoría de las investigaciones sobre la estimulación del nervio vago se realizaron con métodos invasivos, no con dispositivos portátiles. Por lo tanto, un dispositivo portátil que hace referencia a investigaciones invasivas sobre la VNS está tergiversando los datos para vender su producto.
- Estimulación frente a modulación
También es importante tener en cuenta que algunos dispositivos, como Pulsetto o GammaCore, proporcionan una estimulación de alta intensidad que puede aumentar la probabilidad de efectos secundarios y puede perjudicar a las personas con síntomas crónicos cuyo sistema nervioso ya está desregulado. Nurosym con 45 niveles de energía ofrece un control preciso de la modulación para proporcionar los mismos beneficios con menos riesgos.
- Precio
El dispositivo que elijas debe ajustarse a tu presupuesto. Algunos dispositivos tienen un modelo de suscripción que requiere pagos continuos a lo largo del tiempo. Otros, como Nurosym y Sensate son compras únicas. Dado que los beneficios del uso de la VNS requieren un uso constante, cuanto más se utilicen, mejores serán los resultados. Por lo tanto, al considerar la adquisición de un dispositivo, piense a largo plazo en cómo se acumularían los costes de su uso prolongado. Tomando Nurosym por ejemplo, el coste medio del dispositivo es de aproximadamente 2 euros al día durante un año, y después ya no hay que realizar más pagos. Por su parte, GammaCore viene precargado con sesiones para tres meses. Después, será necesario adquirir más sesiones para seguir utilizándolo. Pulsetto ofrece una suscripción de pago a la aplicación, por lo que los costes de uso a largo plazo pueden acumularse.
Protocolo de pruebas
Since these devices are NOT created equal, it’s essential to carefully evaluate their features, effectiveness, and user experience before making a decision. So we set out to compare four of the most popular devices that people purchase for vagus nerve stimulation – Pulsetto, Sensate, Gammacore, and Nurosym. Sin embargo, es importante señalar que, a diferencia de Nurosym y GammaCore, Pulsetto y Sensate no son dispositivos VNS certificados.
Para realizar una comparación precisa, cada dispositivo fue evaluado por un equipo de doctores y profesionales sanitarios. Utilicé cada dispositivo durante un mes, con un descanso de un mes entre cada uno para evitar cualquier efecto residual. Empecé con Sensate, luego Pulsetto, Nurosym, y por último, GammaCore.
Aquí están los resultados y las clasificaciones:
| Nurosym | Gammacore | Pulsetto | Sensate | |
| Evaluado y respaldado por estudios científicos revisados por pares y controlados con placebo | ✓ | ✓ | Χ | Χ |
| Número de estudios científicos realizados | 40+ | 20+ | 0 | 0 |
| Scientific studies investment | $10M+ | $50M+ | $0 | $0 |
| Se puede usar sin aplicación | ✓ | Χ | Χ | Χ |
| Disponible sin receta médica | ✓ | Χ | ✓ | ✓ |
| Modo de acción | Terapia de neuromodulación vagal auricular (AVNT) | Estimulación no invasiva del nervio vago cervical (ncVNS) | Sin modo de acción validado. | Sin modo de acción validado. |
| Zona de aplicación | Rama auricular del nervio vago | Cervical branch of the vagus nerve | Neck | Pecho |
| Entrega | Propio (Eléctrico) | Propio (Eléctrico) | Eléctrico | Vibración |
| Agradabilidad de la estimulación | Agradable, suave | Más intenso, puede apretar la mandíbula. | Más intenso | Sin estimulación directa, vibración agradable. |
| ¿Es necesario usar gel? | No | Yes | Yes | No |
| Duración de la batería | >1 mes | 1 semana | 1 semana | 1 semana |
| Fácil de llevar de viaje | Yes | No | No | Yes |
| Tipo de dispositivo que requiere revisión y aprobación reglamentaria antes de su comercialización | Obligatorio | Obligatorio | Obligatorio | Χ |
| Aprobado para uso público | ✓ | ✓ | Χ | n/a |
| Dispositivo portátil certificado | ✓ | ✓ | Χ | Χ |
| Proceso de evaluación médica en la compra | ✓ | ✓ | Χ | Χ |
| Controles de seguridad documentados | ✓ | ✓ | Χ | Χ |
| SAE (eventos adversos graves) notificados en un estudio científico | 0 | 0 | No hay evaluación científica. Se han notificado efectos adversos en Internet. | Sin evaluación científica. |
| Perfil de riesgo | Bajo riesgo según estudios científicos | Bajo riesgo según estudios científicos | Alto riesgo debido a la falta de estudios científicos e informes de usuarios | Bajo riesgo basado en la entrega (vibración) |
| Coste inicial | £599 | 350 £ (solo los primeros 3 meses) | £209.20 | £299 |
| Costes adicionales | £0 | 466 £ cada 3 meses | 99,99 £ al año. Aplicación de pago con más funciones | 50 £ al año. Aplicación de pago con más funciones |
| Coste total estimado durante 5 años de uso diario | £599 | £10,718 | £709.15 | £549 |
| Recomendación general | Our top pick – Highly recommended | Recomendado para personas que sufren de dolor de cabeza | No recomendado |
Se puede utilizar como herramienta complementaria |
Meet The Doctors
A practicing doctor of psychiatry, Elisabetta has an MBA from INSEAD Business School, and experience in direct patient care, neuroscience research, communication and management. Dr. Burchi is a physician-scientist, working with Parasym in clinical affairs with a track record of publishing in the most important scientific journals such as The Lancet, writing successful grant proposals for the NIH, and leading the production of editorial, clinical, regulatory and promotional material in collaborative multidisciplinary teams. Dr. Burchi has also coordinated clinical trials and implemented a tele-medicine practice which received a certification of excellence among more than 100,000 professionals.
Dr. Elisabetta Burchi, MD, MBA
Translational research lead at Parasym
Take Control of Your Postural Heart Rate Abnormalities Naturally
Join thousands reclaiming stability and energy.
Participate in the Postural Heart Rate Abnormalities research program and save €70 on your Nurosym device.
*Research participation assessment takes less than 3 minutes
50+
studies referenced
4M+
successful sessions delivered
30
Day money back guarantee
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certified medical device
Join thousands reclaiming stability and energy.
Participate in the Postural Heart Rate Abnormalities research program and save €70 on your Nurosym device.
*Research participation assessment takes less than 3 minutes
50+
studies referenced
4M+
successful sessions delivered
30
Day money back guarantee
certified medical device
30-Day Money-Back Guarantee
Every Nurosym Kit is backed by a 30-day, full-refund policy if users aren’t satisfied with their progress.
Got questions? Here is everything you need to know
Symptoms we studied
These symptoms have been linked to autonomic nervous system imbalance and Vagus Nerve Impairment:
- Anxious states and Stress related symptoms
- Chronic Tiredness, Fatigue, Brain Fog, Burnout
- Digestive issues, irritable gut reflux, diarrhoea, constipation, bloating
- Sleep problems
- Negative thought
- Inflammatory symptoms
- Pain, headaches
- Memory & Attention problems
- Postural Heart Rate Abnormalities or fainting
- Post-Viral Symptoms
- Widespread body pain
Our latest research data also suggests Nurosym improves learning and short-term memory and cognition.
Nurosym also has been shown to promote relaxation, mood, sleep, healthy digestion, increased HRV, as well as to alleviate symptoms of stress, burnout, adrenal fatigue.
Parasym research is also investigating the impact of neuromodulation on athletic performance, muscle recovery, weight management problems, substance dependency and more.
If you’re not sure if Nurosym is for you consult with your health professional or contact our support by clicking the Support icon at the bottom right of the page.
When can I start feeling the effects?
The timeframe for experiencing the effects of Nurosym varies. Individuals with severe symptoms may notice improvements within 1 to 3 days, while others may see results within 4 to 6 weeks. Rest assured, the transformative benefits of Nurosym will be within reach.
Nurosym está a salvo?
Neuromodulation via Nurosym is considered safe when used as intended.
Nurosym has these certificates.
– It is based on scientific evidence
– It is safe to use
– It has demonstrated scientific efficacy
Be sure to read the important safety information before use. Thousands of users have tested the device and no serious adverse effects have been reported in studies to date.
What does it feel like?
Feels like a pleasant, light vibration or tingling sensation in your ear.
Are there any additional costs or subscription fees?
There are no additional costs or fees, only the one-time purchase of the Nurosym.
Before using Nurosym
Read the instructions for use before using Nurosym. However, it’s possible this may not be enough to fully explain the safe and effective use of Nurosym in your particular situation. Ask your health professional or contact Nurosym care if you have any questions about how to use Nurosym or require any further clarification.
Only use Nurosym as described in the instructions for use or as otherwise directed by your health professional. Remove jewelry that may interfere with the electrode location (earrings etc.) before using Nurosym. Do not use Nurosym if the skin on the tragus is broken, cracked or numb.
What is the difference between Nurosym and other devices claiming to stimulate nervous system?
Important Safety Note: Exposing the nervous system to untested electrical currents or using DIY Transcutaneous Electrical Nerve Stimulation (TENS) devices carries risks, including potential nerve damage. Prioritize safety and efficacy in your choice.
Devices claiming to affect vagus nerve differ significantly, impacting their effectiveness and safety. Even small differences in factors like waveform and site placement can yield notable results. Most importantly, level of scientific evidence is crucial.
Nurosym is the leading non-invasive vagal neuromodulation system used in scientific research– with over $10M deployed in scientific studies, 50+ published papers in leading journals covering our exciting and scientifically significant results. Our device is one of a few registered medical devices with safety & efficacy confirmed by regulatory bodies in EU.
How long should I use Nurosym each day for optimal results?
We recommend using Nurosym for 1 hour each day, however, benefits can be seen with as little as 15 minutes of use.
Can I perform other activities while using it?
Yes, you can experience the benefits of Neurostimulation anywhere, anytime while doing any activity.
Do I need a prescription to purchase Nurosym?
No. However, we recommend that you consult with your health professional if you’re unsure whether Nurosym is right for you.
What are the details of your 30-day guarantee?
If you try Nurosym daily for 30 days and aren’t happy with your results, we’ll send you a fund refund. No questions asked.
Given the remarkable results Nurosym has had in scientific studies and with our customers around the world, we’re confident in its health restoring effects. Our goal will always be to restore our collective health – restoring health for as many people as we can and in turn, restoring the health of our planet. If Nurosym doesn’t work for you for any reason, we’re happy to send you a refund. This refund period is available 30 days after the date of purchase and expires the following week (37 days after the date of purchase).
Does Nurosym come with a warranty?
Yes! We offer a one-year warranty with every Nurosym device.
How long do orders take to ship?
Orders are processed and dispatched within 1-3 business days.
When will my order arrive?
Nurosym is shipped via priority tracked and signed couriers, so delivery times will vary based on shipping location. When you checkout, you’ll receive an estimated shipping time for your order.
What is in the Nurosym Package?
- Nurosym device
- Earpiece
- USB charger
- Case
- Quick start guide
How to use Nurosym?
REFERENCIAS:
- Chakraborty, P., Farhat, K., Morris, L., Whyte, S., Yu, X., & Stavrakis, S. (2023). Non-invasive vagus nerve stimulation in postural orthostatic tachycardia syndrome. Arrhythmia & Electrophysiology Review, 12, e31. https://doi.org/10.15420/aer.2023.20
- Diedrich, A., Urechie, V., Shiffer, D., Rigo, S., Minonzio, M., Cairo, B., Smith, E. C., Okamoto, L. E., Barbic, F., Bisoglio, A., Porta, A., Biaggioni, I., & Furlan, R. (2021). Transdermal auricular vagus stimulation for the treatment of postural tachycardia syndrome. Autonomic Neuroscience, 236, 102886. https://doi.org/10.1016/j.autneu.2021.102886
- Geng, D., Liu, X., Wang, Y., & Wang, J. (2022). The effect of transcutaneous auricular vagus nerve stimulation on HRV in healthy young people. PLOS ONE, 17(2), e0263833. https://doi.org/10.1371/journal.pone.0263833
- Kim, A. Y., Marduy, A., de Melo, P. S., Gianlorenço, A. C., Kim, C. K., Choi, H., Song, J.-J., & Fregni, F. (2022). Safety of transcutaneous auricular vagus nerve stimulation (taVNS): A systematic review and meta-analysis. Scientific Reports, 12, 22055. https://doi.org/10.1038/s41598-022-25864-1
- Stavrakis, S., Chakraborty, P., Farhat, K., Whyte, S., Morris, L., Asad, Z. U. A., Karfonta, B., Anjum, J., Matlock, H. G., Cai, X., & Yu, X. (2024). Noninvasive vagus nerve stimulation in postural tachycardia syndrome: A randomized clinical trial. JACC: Clinical Electrophysiology, 10(2), 346–355. https://doi.org/10.1016/j.jacep.2023.10.015
- Zheng, Z. S., Simonian, N., Wang, J., & Rosario, E. R. (2024). Transcutaneous vagus nerve stimulation improves Long COVID symptoms in a female cohort: A pilot study. Frontiers in Neurology, 15, 1393371. https://doi.org/10.3389/fneur.2024.1393371
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