5 Nutrients That Support Nervous System Regulation

In Part One of this series, we explored the difference between lifespan and healthspan — and why lifestyle factors like sleep, movement, connection, and stress management are so central to aging well. This month, we're going a layer deeper: into the nutrient support that your nervous system needs to do its job.
The nervous system is the body's command center. It governs how we respond to stress, how we sleep, how we feel emotionally, and how quickly we recover when life gets hard. And like any complex system, it needs the right raw materials to function well.
Here are five evidence-informed nutrients worth knowing about — with the important caveat that supplementation is not one-size-fits-all. Before adding new supplements, always work with a knowledgeable clinician who can assess your individual needs, labs, and any potential interactions with medications.

1. Magnesium
If there's one nutrient that comes up again and again in conversations about stress, sleep, and nervous system health, it's magnesium. And for good reason.
Magnesium plays a direct role in regulating the HPA axis — the body's central stress response system — and helps modulate GABA receptors, which are the nervous system's primary "brake pedals." When magnesium is low, the nervous system becomes more reactive: sleep gets harder, anxiety creeps up, and muscle tension increases.
Research suggests that a significant portion of the population doesn't get enough magnesium through diet alone, partly because our soil has become increasingly depleted. Forms like magnesium glycinate and magnesium threonate tend to be well-tolerated and better absorbed than older forms like magnesium oxide.
* The Magnesium Miracle by Dr. Carolyn Dean — a comprehensive and accessible look at magnesium's role across the body and brain. 
Boyle, N. B., Lawton, C., & Dye, L. (2017). The effects of magnesium supplementation on subjective anxiety and stress. Nutrients, 9(5), 429.

2. Omega-3 Fatty Acids (EPA and DHA)
Omega-3 fatty acids — particularly EPA and DHA — are foundational to brain and nervous system health. DHA makes up a significant portion of the brain's structural fat, and EPA plays a powerful anti-inflammatory role that directly affects mood and nervous system resilience.
Research consistently links higher omega-3 intake with reduced symptoms of anxiety and depression, improved emotional regulation, and better cognitive aging. From a nervous system standpoint, omega-3s help reduce neuroinflammation, support myelin integrity (the protective sheath around nerve fibers), and promote healthy neurotransmitter signaling.
Food sources include fatty fish like salmon, sardines, and mackerel. For those who don't eat fish regularly, a quality fish oil or algae-based supplement is worth considering.
The Omega-3 Connection by Dr. Andrew Stoll — an early and still-relevant exploration of omega-3s and mental health, written by a Harvard psychiatrist.
Found My Fitness with Dr. Rhonda Patrick — she has devoted multiple episodes to omega-3 research and brain health, including dosing and sourcing guidance. 
Grosso, G., et al. (2014). Role of omega-3 fatty acids in the treatment of depressive disorders: A comprehensive meta-analysis. PLOS ONE, 9(5).

3. Vitamin D3
Often called the "sunshine vitamin," vitamin D functions more like a hormone than a traditional nutrient — and its influence on the nervous system is significant. Vitamin D receptors are found throughout the brain, including in areas that regulate mood, memory, and stress response.
Low vitamin D levels have been associated with increased rates of depression, anxiety, cognitive decline, and poor sleep quality. Many people living in northern latitudes, working indoors, or with darker skin tones are chronically deficient without knowing it — which is why checking your levels through a simple blood test is always the right starting point.
D3 is typically the preferred supplemental form, and it's often paired with K2 to support proper calcium metabolism when taken in higher doses.
The Vitamin D Solution by Dr. Michael F. Holick — the leading researcher in vitamin D science makes the case clearly and practically. 
Feel Better, Live More with Dr. Rangan Chatterjee, Episode 22: "The Vitamin D Deficiency Epidemic" — approachable and clinically grounded. 
Shaffer, J. A., et al. (2020). Vitamin D supplementation for depressive symptoms: A systematic review and meta-analysis. Psychosomatic Medicine, 76(3), 190–196.

4. B Vitamins (B6, Folate, and B12)
The B vitamin family — particularly B6, B9 (folate), and B12 — are essential cofactors in the production of neurotransmitters like serotonin, dopamine, and GABA. Without adequate B vitamins, your body simply can't make the chemical messengers your nervous system depends on for mood stability, focus, and calm.
B12 deficiency in particular is under-diagnosed and can mimic anxiety, depression, fatigue, and even early cognitive decline. B6 is critical for converting tryptophan into serotonin. And folate (in its active methylated form, 5-MTHF) plays a key role in methylation — a process that affects everything from neurotransmitter balance to stress response and inflammation.
Those with the MTHFR gene variant may have difficulty converting folic acid to its active form, which is why methylated B vitamins are often the preferred option in functional medicine settings.
Could It Be B12? An Epidemic of Misdiagnoses by Sally Pacholok & Jeffrey Stuart — a well-documented and eye-opening resource on how B12 deficiency is routinely missed. 
Kennedy, D. O. (2016). B vitamins and the brain: Mechanisms, dose and efficacy. Nutrients, 8(2), 68.

5. L-Theanine
L-theanine is an amino acid found naturally in green tea, and it has a quietly remarkable effect on the nervous system. It promotes calm alertness — relaxation without sedation — by increasing alpha brain wave activity and supporting GABA, serotonin, and dopamine pathways.
What makes L-theanine particularly interesting is that it doesn't blunt focus or cause drowsiness. Instead, it takes the edge off activation and reactivity while keeping the mind clear. For people managing chronic stress, anxiety-driven sleep disruption, or nervous system hyperarousal, it can be a gentle but meaningful support.
It's often paired with caffeine in research settings — the combination appears to smooth out caffeine's activating effects while preserving alertness — which is part of why a mindful cup of matcha feels so different from a rushed espresso.
YouTube: Dr. Andrew Huberman, Huberman Lab — "Using Caffeine to Optimize Mental & Physical Performance" covers the L-theanine + caffeine interaction with solid mechanistic depth.
Kimura, K., et al. (2007). L-theanine reduces psychological and physiological stress responses. Biological Psychology, 74(1), 39–45.

A Note on Integration
Nutrients don't work in isolation — and neither do people. The most effective support for nervous system regulation combines thoughtful nutrition and targeted supplementation with the relational, behavioral, and emotional work that therapy offers. What we eat matters. And so does how we process stress, how we sleep, and how much space we give ourselves to rest and feel supported.
If you're navigating chronic stress, nervous system dysregulation, or the emotional weight of aging and life transitions, that's exactly where therapy comes in. Reach out to Debra to explore what a personalized, integrative approach to wellbeing might look like for you.

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