As a GP, I understand the science behind vagus nerve stimulation. I know the vagus nerve is the body’s master regulator, that it connects the brain to the body, and that it governs that all-important shift from ‘fight-or-flight’ into ‘rest-and-digest’. I know the mechanism, but I don’t think I really expected the impact.

I definitely wasn’t prepared for how much of a difference I would feel.

How I yōjō

My routine is simple.

Every night, when I go to bed, I grab my yōjō. I apply the gel to the earpiece and pop it in my ear. I find a comfortable intensity and then just let the gentle electrical pulses do their thing.

I also use it during the day when I remember. This is becoming more frequent because the benefits have become harder to ignore.

The sensation took a little getting used to — little electrical zaps that you have to set to your comfort level — but it quickly became something I looked forward to rather than something I had to remind myself to do.

What surprised me most

Sleep. Sleep. Sleep.

I’ve always been someone who can lie awake, mind whirring, tossing and turning for hours before finally dropping off. In the first few days of using yōjō, I noticed I was falling asleep faster.

At first, I put this down to coincidence, a good few days, or a placebo effect. But now, several months in, I can say with confidence that it is none of these.

On the nights I use yōjō versus the nights I don’t, there is a noticeable difference.

My Garmin data backs this up, too: sleep quality has genuinely improved, not just my perception of it. And that matters to me as someone who values having objective data alongside improvements in how I feel.

Getting to sleep faster has been the biggest win.

Anyone who knows that particular frustration of lying in the dark, wide awake, brain refusing to switch off, will easily understand just how significant this has been.

A shift in how I think about my nervous system

Something I didn’t anticipate was how using yōjō would make me more intentional about my parasympathetic nervous system more broadly.

Understanding something intellectually and actively working on it are two different things. yōjō has brought vagal tone into my daily awareness in a way that’s spilled over into other habits.

I now use the physiological sigh regularly — a double inhale through the nose followed by a long exhale — which is one of the fastest ways to manually activate your parasympathetic nervous system. It’s the kind of technique I’ve always known about, but yōjō has made me more motivated to layer these practices together.

I feel more in control of my own nervous system regulation, and that feeling of agency is something I hadn’t expected to value as much as I do.

Would I recommend it?‍

I started this journey curious. I’m continuing it as a genuine convert.

Whether you’re someone who struggles to wind down at night, feels chronically overstimulated, or simply wants to feel more grounded in your own body, yōjō offers something that is both accessible and, in my experience, genuinely effective.

The science was always there. And now I’ve felt it for myself.

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Most of us were taught that the immune system is the body's army. It fights off invaders, clears out damaged cells, and keeps us safe from infection. That framing is not wrong, but it is incomplete and affects how we understand chronic inflammation, fatigue, and so many of the modern health struggles people face every day.

Not just a defense force, your immune system is a communication network, and the vagus nerve is one of its most important lines of conversation.

The immune system is everywhere

Here is something that might surprise you. Immune cells are not sitting in one place waiting to be called into battle. They live in every organ in your body, including your brain, your gut, your heart, your lungs, and your skin. They are constantly sampling their environment, sending and receiving signals, and reporting on the state of surrounding tissue.

Your immune system is in ongoing dialogue with your organs and your nervous system, and the vagus nerve sits right at the center of that conversation.

If your nervous system is the postal service, then the vagus nerve is the main highway that runs through every town. Immune cells along that route are the local post offices, constantly sending letters up the line and receiving instructions back. When that highway is functioning well, communication is fast, accurate, and balanced. When the road is damaged or congested, messages get lost or distorted, and things start to break down.

The neuroimmune axis

Scientists have a name for this relationship between the nervous and immune systems. They call it the neuroimmune axis, and the vagus nerve is its primary physical structure.

In fact, a large portion of the signals your brain receives about what is happening in your body do not come from pain receptors or sensory organs. They come from immune cells.

Your immune system is one of the main sources of information flowing into the vagus nerve, which means your sense of how safe, energized, or unwell you feel is shaped in part by the state of your immune function.

Acetylcholine and the cholinergic anti-inflammatory pathway

When the vagus nerve is active and well-toned, it releases a neurotransmitter called acetylcholine. This molecule has a remarkable and underappreciated job: it directly calms immune cells, specifically macrophages, which are major producers of inflammatory signals in the body.

When acetylcholine binds to these cells, it tells them to slow down the production of inflammatory cytokines — molecules that allow signals to travel between immune cells — slowing the spread of inflammation.

This is what researchers call the cholinergic anti-inflammatory pathway, one of the most elegant self-regulating systems in the human body.

Imagine a fire crew that not only responds to fires but also goes around town checking smoke alarms, fixing faulty wiring, and training residents so that fires are less likely to start in the first place.

That is closer to what the vagus nerve does for immune regulation through this pathway. It does not just react to inflammation, but actively keeps it in check, around the clock, as long as it has the tone and activation it needs to do so.

When vagus nerve tone is low, this system weakens. Immune cells become more reactive, inflammatory cytokine signals build up without adequate counterbalances, and the body begins to feel the effects in ways that often get labelled as mysterious or hard to explain.

What this means for you

Understanding the neuroimmune axis changes our thinking from how to suppress inflammation after it has already started to how to support the vagus nerve, so that the body will regulate itself more effectively.

Vagus nerve stimulation, whether through breathwork, specific frequencies, or targeted device-based approaches, is one of the most promising areas of emerging research in this space.

At yōjō, this science is at the core of how we think about building tools and practices that support the nervous system from the inside out.

The yōjō VNS protocol is designed specifically to help rebuild that capacity.

Consistent, targeted stimulation of the vagus nerve helps restore the tone and signaling strength the nerve needs to function well. Over time, this means the nerve becomes more capable of sending and receiving the communication signals that keep your immune cells calibrated, your inflammatory response balanced, and your organs in genuine conversation with your nervous system.

It is not a quick fix. It is a gradual restoration of something the body was always meant to do on its own.

Your immune system was never just a fighter. It has always been listening. The question is whether your vagus nerve has the strength to answer.

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Does stress ever feel like a real, physical threat to you? Nothing has actually happened, no danger is in the room, yet your body acts like something is about to attack you.

As strange as it may seem, to your nervous system, that reaction makes sense because, to your nervous system, the threat is real.

Your brain scans for danger all the time. A small almond-shaped part of the brain called the amygdala flags anything that might be a threat. It then signals another region, the hypothalamus, to get the body ready to respond. The hypothalamus turns on two stress systems at once. The first is the sympathetic nervous system, which releases adrenaline. The second is the HPA axis, which releases cortisol.

This is the fight-or-flight response. Your heart speeds up, blood pressure rises, muscles tense up, digestion slows, and focus sharpens.

The body runs this same response whether the trigger is a wild animal, an injury, or a short message from your boss.

Research suggests physical and psychological threats activate the same two stress pathways — the sympathetic nervous system and the HPA axis — releasing the same core hormones, even though the brain processes each kind of threat a little differently.

Physical threats are handled quickly by lower brain regions. Psychological threats involve higher-thinking areas — the prefrontal cortex, amygdala, and hippocampus. That's because they need to be interpreted. A deadline is only taken to be dangerous once you’ve decided it is. Your body then reacts to it as if it had teeth.

Why modern life confuses your stress system

Fight-or-flight evolved for one kind of problem: short, physical, and over quite quickly. A predator shows up, you run, fight, or freeze, and within minutes the threat ends. If you survive, your body powers down and gets back to normal.

The scientist Robert Sapolsky explains this in his book Why Zebras Don't Get Ulcers. A zebra escapes a lion and returns to grazing within minutes. It does not sit under a tree worrying about the next attack.

Humans do. We ruminate. Cows are called ruminants because they chew cud. We chew the cud of our minds — endlessly replaying past mistakes or worrying about the future.

We can create a threat just by thinking about one. A deadline three weeks away, a text someone hasn't replied to, a meeting tomorrow, a vague message that could mean two things. Your nervous system treats each of these like real danger, but unlike a predator, they do not go away … they stretch out for hours, days, weeks.

Scientists call this an evolutionary mismatch. Your ancient threat system has not caught up to the modern world it is running in.

Why notifications, meetings, and deadlines feel so heavy

Modern stress has three features that make it especially hard on the nervous system.

It is anticipated.

Your body reacts to threats that have not happened yet. The dread before a meeting can feel as physical as the meeting itself.

It is social.

Conflict at work, feeling left out, or unclear messages can activate the same circuits as physical danger. Research suggests social pain and physical pain use some of the same brain pathways.

It is always-on.

Notifications, group chats, open inboxes, and constant availability mean your nervous system rarely gets the all-clear signal. The threat never fully ends.

A predator encounter ends, an inbox doesn’t.

What this does to your body over time

When the sympathetic nervous system and HPA axis stay active for too long, the body builds up what researchers call allostatic load — the wear and tear from being on alert too often.

Long-term cortisol dysfunction affects heart health, immune function, sleep, memory, and metabolism. Sapolsky’s research shows that chronic stress also weakens the parasympathetic nervous system, the part that calms the body down. Over time, the body has a harder time switching off even after the stress is gone.

How to read your stress response differently

Understanding the biology gives you new options.

If a tight chest before opening an email is a flaw, the only fix is to try harder, care less, or push through. None of those work, because none of them deal with the system causing the reaction.

But if a tight chest is your amygdala doing its job in the wrong environment, the question changes. How do you help your system finish the response and return to a calm state?

This is what nervous system regulation means. There’s no need to suppress your stress response when you can support your rest and recovery response.

Slow exhales activate your vagus nerve, which calms your body. Short pauses between stressful moments let your system register safety more often. Sleep, movement, and steady recovery habits train your nervous system to settle down more easily over time.

Evidence indicates regulation is trainable. Vagal tone — a measure of how well your parasympathetic nervous system works, often tracked through heart rate variability (HRV) — improves with steady, repeated practice. The goal is to handle stress by giving your body the signal that the threat has passed.

Vagus nerve stimulation is a precision-engineered and convenient way to do that every day.

The takeaway

When your body reacts to an email like it is a predator, don’t think of it as overreacting. It is a survival response, largely out of your hands. Your nervous system is doing exactly what it evolved to do: spot a threat, ready reserves for action, protect you.

The mismatch is in the environment, not in you.