Does activating the vagus nerve always lead to calming?

No, this is a common misconception. While certain branches of the vagus nerve can induce calming, others, particularly those activated by physical activity, can increase alertness and sympathetic nervous system activity.

How can I quickly calm down using my vagus nerve?

The fastest way to calm down is by performing a physiological sigh: two inhales through the nose followed by a long, slow exhale through the mouth until your lungs are empty. This rapidly activates the parasympathetic nervous system.

What is Heart Rate Variability (HRV) and how can I improve it?

HRV is the variation in time between heartbeats, and a higher HRV is associated with better health outcomes. You can improve HRV by incorporating deliberate, extended exhales throughout the day (10-20 times) and through high-intensity interval training.

How does physical activity affect my brain's alertness through the vagus nerve?

Moving large muscles, especially legs and trunk, releases adrenaline which binds to vagus nerve receptors. This chain reaction ultimately leads to the release of norepinephrine in the brain, increasing alertness, motivation, and focus without crossing the blood-brain barrier.

Can the vagus nerve enhance neuroplasticity and learning in adults?

Yes, high-intensity exercise activates vagus nerve pathways that stimulate the release of norepinephrine (for alertness) and acetylcholine (for focus) in the brain. This creates an enhanced window for neuroplasticity and learning, particularly in the hours following exercise.

How is serotonin in the gut connected to serotonin in the brain and mood?

Serotonin in the gut, largely produced by enterochromaffin cells, binds to vagus nerve axons. This signal is relayed to the dorsal raphe nucleus in the brain, which then releases serotonin, impacting mood. Healthy gut microbiota and sufficient tryptophan intake support this process.

What dietary changes can I make to support my gut-brain axis and mood?

Consume 1-4 servings of low-sugar fermented foods daily (e.g., kimchi, sauerkraut, kombucha, kefir) to promote diverse gut microbiota. Also, ensure adequate intake of tryptophan-rich foods like dairy or white turkey meat.

Are there other simple, mechanistically supported ways to calm down using the vagus nerve besides breathing exercises?

Yes, two other methods include performing specific neck stretches (turning head up/right and up/left while pushing elbows down) and humming with an emphasis on the 'H' sound to create deep vibrations in the throat, chest, and diaphragm, which mechanically activate vagal pathways.

Where can I find more in-depth information about Dr. Huberman's protocols and research?

You can subscribe to the zero-cost Neural Network newsletter at hubermanlab.com for podcast summaries and printable protocols on various topics like sleep, dopamine, and fitness. Also, Dr. Huberman's new book, 'Protocols: An Operating Manual for the Human Body,' is available for pre-sale.

Control Your Vagus Nerve to Improve Mood, Alertness & Neuroplasticity

Andrew Huberman

Science & Technology3 min read112 min video

Jun 23, 2025|530,866 views|15,892|1,011

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Key Moments

TL;DR

The vagus nerve, cranial nerve 10, profoundly impacts mood, alertness, and neuroplasticity. Learn to consciously control it for health and well-being.

Key Insights

The vagus nerve is a bi-directional superhighway linking the brain and body, not just a "calming" nerve.

It carries both sensory (body to brain) and motor (brain to body) information, categorized by mechanical or chemical signals.

Stimulating specific vagal pathways can increase alertness, enhance learning and neuroplasticity, and improve mood via mechanisms like adrenaline and acetylcholine.

Consciously controlling the vagus nerve through deliberate breathing, humming, and neck stretches can improve heart rate variability (HRV) and promote relaxation.

The gut-brain axis, mediated by the vagus nerve, influences serotonin levels in the brain, impacting mood and well-being.

Regular engagement with vagus nerve activation protocols can strengthen its function and improve overall health and longevity.

UNDERSTANDING THE VAGUS NERVE'S EXTENSIVE ROLE

The vagus nerve, or cranial nerve 10, is a vast neural pathway that connects the brain to numerous organs throughout the body, functioning almost as a secondary nervous system. Unlike typical nerves, it has extensive connections, making it a superhighway for bidirectional communication. Recent research has revealed its significant impact on mood, digestion, alertness, and even food cravings. Crucially, it plays a key role in regulating heart rate variability (HRV), a significant marker for overall health and longevity.

SENSORY AND MOTOR PATHWAYS: A DUAL FUNCTION

A common misconception is that the vagus nerve solely governs relaxation. In reality, it contains both sensory and motor neurons. The sensory pathways transmit information about the body's internal state, including mechanical (like gut distension) and chemical signals (like serotonin levels), from organs to the brain. The motor pathways transmit signals from the brain to the body, controlling organ function and other physiological processes. Understanding this dual nature is essential for leveraging the vagus nerve for specific outcomes, such as increased alertness or calm.

CONTROLLING AUTONOMIC BALANCE AND HEART RATE VARIABILITY

The vagus nerve is a primary component of the parasympathetic nervous system, which balances the sympathetic 'fight or flight' response. By influencing the sinoatrial node in the heart through motor pathways originating in the nucleus ambiguous, the vagus nerve controls heart rate deceleration. This control is intrinsically linked to breathing patterns, with exhalations slowing the heart rate. Deliberate, extended exhales and techniques like the physiological sigh can quickly shift the autonomic balance towards calm, increase HRV, and promote autoregulation.

ENHANCING ALERTNESS, FOCUS, AND NEUROPLASTICITY THROUGH MOVEMENT

Contrary to the sole calming narrative, stimulating the vagus nerve can also increase alertness. Physical activity, especially involving large muscle groups, triggers the release of adrenaline, which binds to vagus nerve receptors. This interaction, via the NTS and locus ceruleus, leads to the release of norepinephrine, enhancing brain alertness. This mechanism is crucial for motivation and focus, serving as a non-pharmacological method to improve cognitive function and learning capacity, thereby supporting neuroplasticity.

THE GUT-BRAIN CONNECTION AND SEROTONIN REGULATION

The vagus nerve plays a pivotal role in the gut-brain axis, particularly concerning serotonin production. While 90% of the body's serotonin is synthesized in the gut, it doesn't directly transfer to the brain. Instead, gut serotonin levels, influenced by factors like gut microbiota diversity and tryptophan intake, are communicated to the brain via the vagus nerve. This signals the brain's dorsal raphe nucleus to release serotonin, impacting mood and well-being and facilitating neuroplasticity.

ACTIONABLE TOOLS FOR VAGAL ACTIVATION AND CALMING

Specific practices can be employed to consciously engage the vagus nerve for desired outcomes. The physiological sigh offers rapid calming by maximizing exhalation. Deliberate long exhales throughout the day improve HRV and autoregulation. Gentle stimulation of ear and neck regions can activate specific vagal pathways. Humming, particularly extending the 'H' sound, and performing neck stretches that engage vagal nerve fibers can also promote relaxation and parasympathetic responses, demonstrating the profound potential for self-regulation.

Mentioned in This Episode

●Supplements

●Products

●Companies

●Books

●People Referenced

Vagus Nerve Activation Protocols for Alertness, Calm & Mood

Practical takeaways from this episode

Do This

Practice deliberate extended exhales 10-20 times per day to improve heart rate variability (HRV) and autoregulation.

Engage in high-intensity physical activity involving large muscles (legs, trunk) to increase alertness, motivation, and neuroplasticity.

Consume 1-4 servings of low-sugar fermented foods daily (kimchi, sauerkraut, kombucha, kefir) to support gut microbiome and serotonin production.

Ensure sufficient dietary tryptophan intake to support serotonin production.

Supplement with a quality probiotic periodically, especially for low mood.

Perform specific neck stretches (turning head up and right/left while pushing elbows down) to mechanically activate vagus nerve fibers for mild calming.

Hum with an emphasis on the 'H' sound, trying to feel vibrations in the throat, chest, and diaphragm, for deep relaxation.

Avoid This

Avoid nicotine in habit-forming or health-damaging forms like smoking, vaping, dipping, or snuffing, especially for daily cognitive enhancement.

Do not take high-intensity exercise to exhaustion immediately before focused learning, as it can lead to depletion and increased parasympathetic activity.

Common Questions

The vagus nerve (cranial nerve 10) is an extensive pathway linking the brain and body, involved in numerous functions including mood, alertness, relaxation, and learning. It's unique for its widespread connections and its actionable nature, allowing deliberate control over these functions.

Topics

Parasympathetic Nervous System Sympathetic Nervous System Physiological Sigh Mental Performance Acetylcholine

Mentioned in this video

supplementHuperzine A

Supplement that stimulates the release of acetylcholine, opening opportunities for enhanced neuroplasticity.

supplementMagnesium Orotate

A form of magnesium used in a clinical trial that showed short-term improvement in major depressive disorder symptoms when combined with probiotics and CoQ10.

personPeter Strick

Scientist at the University of Pittsburgh whose lab conducted research on brain-body connections and adrenal glands.

supplementCoenzyme Q10 (CoQ10)

Supplement used in a clinical trial that showed short-term improvement in major depressive disorder symptoms when combined with probiotics and Magnesium Orotate.

personStephen Porges

Author of 'Polyvagal Theory', credited for his significant contributions to understanding the vagus nerve.

toolROKA

conceptPolyvagal Theory