If you have ever had to cancel plans, leave work early, or retreat to a dark room because of a migraine, you already know that this condition controls more than just your head. It affects your entire life. You may have tried multiple conventional options and still find yourself searching for something that works differently.
At Johnson Chiropractic Neurology & Nutrition, my approach considers the whole person, including factors that may contribute to repeated attacks.
In this article, I want to explain how a device called gammaCore Sapphire uses non-invasive vagus nerve stimulation to help treat and prevent migraines, what clinical research shows, including its limits, and how it may fit into an individualized care plan alongside functional medicine, functional neurology, and appropriate chiropractic care.
gammaCore Sapphire is a handheld, rechargeable medical device made by electroCore. It delivers gentle electrical stimulation to the vagus nerve through the skin on the side of your neck. This approach is called non-invasive vagus nerve stimulation, or nVNS.
The vagus nerve is one of the longest nerves in your body. Think of it as a major communication highway connecting your brain to your heart, lungs, digestive system, and many other organs. It plays a central role in regulating inflammation, pain perception, and the balance between your body’s alert and recovery responses.
Research supports the idea that stimulating this nerve at the neck activates specific brain regions involved in pain processing. A 2017 fMRI study by Frangos and Komisaruk confirmed that cervical vagus nerve stimulation through the skin activates brainstem nuclei, including areas that help process incoming nerve signals [3]. Separately, Nonis et al. (2017) demonstrated through electrophysiology that nVNS at the neck activates nerve pathways carrying signals toward the brain in healthy volunteers [2].
As described in the manufacturer’s device overview, gammaCore is portable and adjustable. Each stimulation takes two minutes; a prescribed treatment may include more than one stimulation. Your prescribing clinician determines how many stimulations per day are appropriate for your situation, up to a maximum of 24 stimulations as specified in the device labeling.
electroCore’s clinical efficacy page highlights the PRESTO study (Tassorelli et al., 2018), a study that compared active stimulation with a sham device in 243 adults with episodic migraine [1].
I want to be transparent about what this study found, because the details matter.
The study’s main goal was complete freedom from pain at two hours. Before looking at the results, it helps to understand the small numbers labeled “p” below.
A p-value helps researchers ask: If the treatment and comparison really worked equally well, how surprising would results like these be? A smaller p-value means the results would be less expected under that assumption and the statistical model used.
For example, p = 0.012 means that, assuming there is no real difference and the study’s statistical assumptions hold, results this extreme or more extreme would occur about 1.2% of the time. It does not mean there is a 98.8% chance the treatment works.
Researchers often use p < 0.05 as the cutoff for “statistically significant.” A result above that cutoff, such as p = 0.067, does not prove a treatment has no benefit. It means that result did not meet the chosen cutoff.
A p-value also does not tell you how much relief you might feel or whether a treatment is right for you. I consider the size of the benefit, study quality, safety, and your health history alongside these numbers [8].
"Pain relief" (a drop from moderate or severe pain to mild or no pain) and "pain freedom" (complete elimination of pain) are different measures. The PRESTO data showed meaningful pain relief at 120 minutes even when complete pain freedom did not reach statistical significance.
According to electroCore’s efficacy summary [6], when researchers evaluated all treated migraine attacks rather than only the first, nearly half of the patients using gammaCore reported mild or no pain at 120 minutes for more than 50% of their treated attacks. gammaCore also reduced the need for rescue interventions during the study period.
The PREMIUM trial (Diener et al., 2019) was a study of migraine prevention in 332 participants in its main analysis [4]. Active stimulation was compared with a sham device.
Because the positive findings came from an extra analysis rather than the study’s main planned test, they suggest possible benefit rather than prove it for everyone. The trial does suggest that consistent daily use may matter for preventive benefit.
gammaCore also has FDA clearance for cluster headache, but cluster headache and migraine are distinct conditions with different underlying mechanisms. The cluster headache evidence (PREVA, ACT1, ACT2 trials) does not directly apply to migraine and should not be confused with the migraine-specific results above.
Conventional migraine approaches generally work by altering brain chemistry or blocking specific receptors. nVNS works through a fundamentally different pathway: it modulates neurological pain signaling by stimulating the vagus nerve rather than delivering a drug [7]. These studies do not establish that gammaCore works better than a specific prescription treatment.
This does not mean nVNS is a replacement for your current prescribed care. You should always continue any treatment your prescriber has recommended unless they advise otherwise. nVNS may serve as an adjunct option, used alongside other approaches under clinical guidance.
My multimodal approach combines several forms of care based on your history and findings. Migraine is a neurological condition, and no single tool works for everyone. My care options support an individualized plan rather than a fixed package.
At Johnson Chiropractic Neurology & Nutrition, I combine functional neurology, functional medicine, integrative care, and appropriate chiropractic adjustments to explore factors that may contribute to your symptoms. gammaCore Sapphire may be one component of that plan. The gammaCore studies did not test my complete multimodal approach, so their results should not be presented as proof of the combined program.
Make room for more of the life you enjoy. Call 586-731-8840 to request a migraine case review. Let’s explore your history, your goals, and which care options may fit your needs.
Call to Request a Migraine Case Review
If you are dealing with disruptive migraines and want to explore a natural, whole-person approach, here are the steps to get started:
Could at-home vagus nerve stimulation fit your care? Call 586-731-8840 and ask about renting gammaCore Sapphire from my office. We can discuss clinical suitability, rental terms, and proper training before you decide.
Call to Ask About gammaCore Rental
gammaCore Sapphire is a prescription device that requires a clinical evaluation before use. If you are interested in exploring whether it may be appropriate for your migraine care, call 586-731-8840 to inquire about:
gammaCore Sapphire is FDA-cleared for the preventive and acute treatment of migraine in patients aged 12 and older. It is prescription-only and requires evaluation by a licensed healthcare provider.
Review the manufacturer’s important safety information with your clinician. Do not use the device while driving or share it with another person.
The clinical safety profile across multiple randomized trials has been favorable, with most device-related adverse events being mild and transient (primarily application-site discomfort). However, several important safety considerations apply:
Seek urgent medical attention for a sudden, extremely severe headache, new weakness, trouble speaking, or a headache with fever and a stiff neck. Do not assume an unusual headache is your usual migraine.
gammaCore Sapphire is an FDA-cleared, handheld device for the acute treatment and prevention of migraine in patients aged 12 and older. It delivers non-invasive vagus nerve stimulation through the skin on the side of the neck. Johnson Chiropractic Neurology & Nutrition includes gammaCore Sapphire as one element within broader, individualized migraine care.
In the PRESTO clinical trial, statistically significant pain freedom occurred as early as 30 minutes after treatment (Tassorelli et al., 2018). Results varied between individuals, and the primary 120-minute pain freedom endpoint did not reach statistical significance. Pain relief, which measures improvement rather than complete elimination, showed additional benefit at two hours.
The PREMIUM trial did not reach significance for migraine prevention in the full main-analysis group (Diener et al., 2019). An additional analysis of people who followed at least 67% of the treatment schedule showed a statistically significant reduction in migraine days. At Johnson Chiropractic Neurology & Nutrition, we consider gammaCore alongside a review of factors that may contribute to repeated attacks.
gammaCore has demonstrated a generally favorable safety profile in clinical trials. The most common device-related effects are mild, temporary skin irritation and application-site discomfort. Specific contraindications include active implanted electronic devices, and pregnancy and cardiovascular conditions require clinical review. No device is risk-free, so a thorough screening with your provider is an important first step.
Yes. gammaCore is designed to be used as an adjunct to other care approaches, not as a replacement. Continue any prescribed care unless your prescriber advises otherwise. Your provider should coordinate how gammaCore fits into your overall plan.
Yes. gammaCore Sapphire is prescription-only. A licensed healthcare provider must evaluate your health history and determine that vagus nerve stimulation is appropriate for you. To start the process at our Shelby Township office, call 586-731-8840.
If you or someone you care about is struggling with migraines that have not responded to conventional care, consider whether a deeper investigation into the possible contributing factors might be worth pursuing.
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Could there be another piece of the puzzle to explore in your migraine care?
If you’d like to understand more about the natural, whole-person approach that guides my work, I invite you to explore what makes my philosophy of care unique.
Always remember one of my guiding principles: the more you understand how your body works, the better you can care for yourself and support your long-term health.
For a deeper look at the natural, whole-person approach I use with my patients, you may enjoy my book, Reclaim Your Life: Your Guide To Revealing Your Body’s Life-Changing Secrets For Renewed Health. It is available in my office, on Amazon, and through many other booksellers.