Understanding Magnesium: Types, Benefits, and How to Choose the Right Supplement
- Dr Anupa Dharamsi
- Nov 3, 2025
- 8 min read
Magnesium is one of the most under-appreciated minerals in modern health. It quietly supports over 300 biochemical reactions in your body — helping muscles relax, nerves communicate, your heart beat rhythmically, and your mind unwind.
In my clinic, I think about magnesium a lot. Not as a stand-alone fix, but as one of the building blocks that lets your nervous system actually use the space an adjustment creates. I can help your spine and nervous system find that window of calm in the room — but what you're made of, cell by cell, has a lot to say about how long that calm lasts once you walk out the door.
This article walks through what magnesium does, how to choose the right form for what you need, what to watch for if you're on medication, and why I see it as a cornerstone nutrient for nervous-system regulation — alongside nutrients like omega-3s and vitamin D.
Why Magnesium Matters for Your Nervous System
Every cell in your body depends on magnesium to function. It's required to make energy, synthesise DNA and protein, and regulate the flow of calcium and potassium through cell membranes — processes that directly affect muscle tone, nerve signalling, and heart rhythm.
Here's the part I find most relevant to my work: magnesium is one of the nutrients your body leans on to shift out of a sympathetic, "on-guard" state and into a parasympathetic, rest-and-repair state. Think of your nervous system like a dimmer switch, not an on/off button. An adjustment can loosen the switch. Magnesium is part of what helps it actually turn down.
Despite how essential it is, research consistently shows a large share of adults don't reach recommended intake. New Zealand's soils are naturally magnesium-depleted, and modern fertilising and farming practices haven't reversed that — so even a diet built around fresh, local produce can fall short. Add in daily stress (which increases magnesium loss through urine) and a diet leaning on processed food, and the gap widens further.
Common low-magnesium symptoms include muscle cramps, twitching, headaches, poor sleep, anxiety, and fatigue — signs that your body may be running below its natural operating capacity, not signs that something is fundamentally wrong with you.
The Role of Magnesium in Whole-Body and Immune Health
Magnesium doesn't work in isolation. It interacts with the same nutrients that influence your immune system, inflammation levels, and nervous-system tone — particularly omega-3s and vitamins D and A. Nutrient sufficiency, not any single supplement, is what reduces the body's inflammatory burden and improves overall resilience.
Magnesium supports these pathways by:
Regulating stress hormones and reducing chronic inflammation
Supporting vitamin D activation in the kidneys and liver
Helping control cellular calcium levels, which influence immune signalling
Improving sleep and recovery — two major factors in immune strength
Magnesium creates the foundation other nutrients perform on top of. Together, they help the body adapt, repair, and defend itself — especially during stress, illness, or seasonal immune load. I've written more about this in my posts on Vitamin D and Omega-3 if you want the full picture of how these nutrients work together.
Types of Magnesium and Their Specific Benefits
Not all forms of magnesium absorb the same way, and each has a different clinical application.
1. Magnesium Citrate — for digestion and energy Highly bioavailable and gentle on the stomach. Supports bowel regularity and can relieve mild constipation.
2. Magnesium Glycinate — for calm and sleep Bound with the amino acid glycine, this form is soothing to the nervous system. It's my go-to recommendation for patients working with stress, irritability, or restless sleep, and it pairs naturally with the nervous-system recalibration we're doing through care.
3. Magnesium Malate — for muscle fatigue and energy production Linked to malic acid (found naturally in fruit), this type helps reduce muscle soreness and supports ATP production — your body's energy currency. Useful for chronic tension or fibromyalgia-type fatigue.
4. Magnesium Threonate — for brain and cognitive support A newer form that crosses the blood–brain barrier. Early research suggests it may support memory and focus, particularly during mental strain or burnout recovery — though the evidence base here is still developing, so I treat it as promising rather than proven.
5. Magnesium Chloride — for topical use and relaxation Found in oils, sprays, and bath flakes, and absorbed through the skin. A good option for athletes or anyone wanting to soothe tired muscles after adjustments or long workdays.
6. Magnesium Oxide — for short-term digestive relief Contains a high amount of elemental magnesium but is poorly absorbed. Can help neutralise acid but isn't ideal for long-term supplementation.
Key Benefits of Magnesium
Magnesium supports virtually every major body system:
Muscle & Nerve Function: Prevents cramps and promotes recovery
Heart Health: Supports healthy blood pressure and rhythm
Bone Strength: Works with calcium, vitamin D, and K2 to build density
Sleep & Stress: Calms the nervous system, promoting relaxation
Blood Sugar Balance: Helps manage glucose metabolism
Mood Support: Low magnesium levels are associated with higher rates of anxiety and low mood
For my chiropractic patients, this translates to faster post-adjustment recovery, better sleep quality, and a nervous system with more capacity to adapt to life's stressors.
Magnesium Safety: What to Know Before You Start
This is the section I think gets skipped too often, so I want to be direct about it.
Magnesium is generally very well tolerated, and toxicity from oral supplements is rare in people with healthy kidney function. But "well tolerated" doesn't mean "no interactions" — a few things worth knowing before you add it to your routine:
Blood pressure medication: Magnesium can have an additive effect, so combining the two may lower blood pressure further than expected.
Diuretics and long-term PPI use: These can deplete your magnesium stores over time, which is actually one reason deficiency is worth considering if you're on either long-term.
Antibiotics (tetracyclines and quinolones) and bisphosphonates: Magnesium can bind to these and reduce absorption. Spacing doses 2–4 hours apart usually resolves this.
Kidney conditions: If you have reduced kidney function, magnesium needs medical supervision, since your kidneys are what clear the excess.
Pregnancy: Generally considered safe and even beneficial, but as with any supplement in pregnancy, check in with your midwife or GP first.
If you're on regular medication, the simplest step is to mention magnesium to your GP or pharmacist before you start — it takes two minutes and removes the guesswork. This is exactly the kind of question I'll happily help you think through at your next visit, alongside the GPs and physios I work alongside here at the practice.
Choosing the Right Magnesium Supplement
1. Start with your goal.
For sleep or anxiety: glycinate
For muscle tension: malate or chloride
For cognitive focus: threonate
2. Check quality and purity. Choose third-party-tested, practitioner-grade formulations free from unnecessary fillers.
3. Dosage matters. Most adults need around 200–400mg of elemental magnesium daily. Start low and increase gradually — too much at once commonly causes loose stools, which is your body's way of telling you to slow down, not a sign something's wrong.
4. Consider synergistic nutrients. Formulations that pair magnesium with vitamin B6, vitamin D, or omega-3 fatty acids can support absorption and work across your immune and nervous systems simultaneously.
Natural Food Sources of Magnesium
Leafy greens: spinach, kale, silverbeet
Nuts & seeds: almonds, cashews, pumpkin seeds
Whole grains: brown rice, quinoa
Legumes: lentils, chickpeas, black beans
Fatty fish: salmon, mackerel
Dark chocolate: an enjoyable source with added antioxidant benefits
Because New Zealand's soils are naturally low in magnesium, even a diet built around these whole foods may not fully close the gap for everyone — which is why I look at food first, then consider supplementation as a support layer rather than a replacement.
Magnesium and Your Chiropractic Care
If you're dealing with persistent fatigue, cramping, low mood, poor recovery between visits, or a nervous system that feels like it's stuck in overdrive, magnesium status is often part of the puzzle worth exploring.
Standard blood tests aren't always the most reliable way to check — only a small fraction of your body's magnesium actually circulates in your blood, so a "normal" result doesn't rule out a tissue-level shortfall.
For patients across South Auckland — whether you're coming from Māngere Bridge, Ōtāhuhu, Papatoetoe, or further afield — I integrate nutritional assessment with nervous-system care rather than treating them as separate conversations. Magnesium is one of the first things I review when we're working through recovery, resilience, or building capacity together. We stock clinically tested magnesium supplements in-clinic, chosen for purity, bioavailability, and where you're at in your care plan. Bring it up at your next visit and we'll figure out the right form together.
Frequently Asked Questions
What is the best magnesium supplement for sleep and anxiety in New Zealand? Magnesium glycinate is generally the best-tolerated and most researched form for sleep and anxiety support, thanks to its calming effect on the nervous system. Quality and dose still matter, so it's worth choosing a practitioner-grade product.
Can I take magnesium with blood pressure medication or antibiotics? You can, but timing and monitoring matter. Magnesium may enhance the blood-pressure-lowering effect of some medications, and it can reduce absorption of certain antibiotics (particularly tetracyclines and quinolones) if taken at the same time. Spacing doses by a few hours and checking with your GP or pharmacist first is the safest approach.
How much magnesium should I take each day? Most adults do well with 200–400mg of elemental magnesium daily, ideally starting at the lower end and increasing gradually. Needs vary by body size, stress levels, and diet, so this is a starting range rather than a fixed target.
Is magnesium deficiency common in New Zealand? It's more common than most people realise. New Zealand's soils are naturally magnesium-poor, and stress, processed food, and certain medications all increase how much magnesium the body loses or fails to absorb.
Should I get a magnesium blood test, or just try a supplement? Standard serum testing often misses tissue-level deficiency, since most of your body's magnesium is stored outside the bloodstream. For most healthy adults, a low-risk approach is to trial food-first changes and a well-tolerated supplement over four to eight weeks and track how you feel — but if you're on medication or have a kidney condition, check with your GP first.
Final Thoughts
Magnesium is the quiet powerhouse behind your body's ability to repair, regulate, and relax. It supports the same systems chiropractic care is working with — your nervous system, your muscles, your overall capacity to adapt.
Paired with nutrients like omega-3s and vitamins D and A, magnesium helps build a stable foundation for immune strength, resilience, and long-term wellness. I see it as one part of a much bigger picture — and I'm always happy to talk through where it might fit into yours.
Ready to explore what your nervous system needs? Book your next visit or take the Nervous System Regulation Quiz to get a clearer picture of where you're starting from.
About the Author
Dr Anupa Dharamsi is the founder and lead chiropractor at Handcrafted Chiropractic in Māngere, Auckland — a nervous-system-focused, trauma-informed practice supporting patients across South Auckland with a whole-body approach to care, nutrition, and long-term resilience.
This article is for educational purposes and isn't a substitute for personalised medical advice. Please check with your GP or pharmacist before starting a new supplement, particularly if you're pregnant, have a kidney condition, or take regular medication.
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