By Dayna McCutchin, Director of Nutrition at Coya
Supplementation is a tricky wellness category. On one hand, there is a great justification to be made for supplementing what we aren’t getting elsewhere (ie. through our diet) and addressing deficiencies before they can lead to something more serious. On the other hand, where consumer needs exist, so does a business opportunity – and the wellness industry is practically bursting at the seams with well-marketed products, stacks, and “scientific formulas” promising a direct path to optimization.
In some cases, the purported benefits that have been carefully massaged into catchy hooks and campaigns do live up to the hype. But in other cases, the hype struggles to live up to the actual science – or products that are really only designed for a select customer are misconstrued as something that is beneficial for everyone’s needs.
The truth is that appropriate supplementation requires personalization and, in some instances, diagnostic testing (not best guesses) to identify the gaps that actually need to be filled. But the generalized advice circulating across the internet, billboard campaigns, and touted by influencers is typically built for broad reach, not individual relevance or accuracy. Underneath it all also lies a reality that no supplement brand has a financial incentive to admit: you cannot supplement your way out of an unhealthy lifestyle or poor diet. Supplements can optimize at the fringes. But they are not substitutes for the foundational habits — nutrition, sleep, movement, stress management — that have the greatest leverage on health outcomes. They work with that foundation, not in place of it.
That said, there are a handful of supplements that can address a widespread need and are backed by robust evidence — but they don’t offer a single dramatic outcome to package and pitch. They’re consistently overshadowed by other, sexier category darlings like the peptide boom, the collagen wave, and the increasingly crowded adaptogenic aisle.
Magnesium is one of those supplements.
Magnesium is involved in more than 300 enzymatic reactions in the human body. It impacts sleep quality, mood regulation, bone density, cognitive performance, energy production, and stress response — not as a peripheral player in each, but as a foundational input. Most people aren’t getting enough of it, and most of what’s being sold to address that gap misses the point.
This deep dive will dig into what the research actually says about magnesium, and what it might mean for you.
Magnesium plays a direct role in our foundational infrastructure. Energy production. Protein synthesis. Blood glucose control. Blood pressure regulation. Neurotransmitter function. DNA repair. Muscle contraction and relaxation. Bone density. All of it involves magnesium.
The reason this doesn’t always pack the same marketing punch is because magnesium doesn’t produce outcomes — it supports them. Think of it less like a performance enhancer and more like a city’s electrical grid. You don’t notice the grid when it’s working. But you definitely notice everything that stops functioning when it doesn’t.
Sleep might be evading you because magnesium regulates GABA — the inhibitory neurotransmitter that quiets the nervous system and allows the brain to transition into rest. You might be plagued with muscle cramps because magnesium is required for muscles to fully release after contracting. You might be grappling with anxiety and mood dysregulation because magnesium helps modulate the HPA axis, the body’s primary stress-response system, and when levels drop, that axis can become hyper-reactive. Fatigue might be accumulating because without adequate magnesium, the mitochondria can’t produce ATP — cellular energy — efficiently.
These are all downstream expressions of a foundational deficit.
It is estimated that 70-80% of US adults have insufficient or marginal magnesium status — not because they’re eating poorly by their own standards, but because the food system itself has changed.
Industrial farming practices have significantly depleted mineral content in soil over the past several decades. The vegetables being grown are the same; the mineral density in those vegetables is not. Magnesium-rich foods like dark leafy greens, nuts, seeds, legumes, and whole grains are in most people’s diets to some degree. But the actual magnesium content of those foods simply isn’t what it was.
There are also compounding lifestyle factors to consider:
Alcohol impairs magnesium absorption and increases urinary excretion.
Chronic stress depletes magnesium because cortisol triggers increased excretion.
Certain common medications (diuretics, PPIs, oral contraceptives, some antibiotics) reduce magnesium levels as a side effect.
High sugar intake increases magnesium excretion.
Low intake of whole foods and high intake of processed foods can result in low intake.
Sweating, whether from exercise or heat exposure, can further deplete magnesium levels.
For most adults managing the stress and pressure of work and life, several of these factors are in play simultaneously — quietly, while the body does its best to compensate.
The catch is that serum magnesium (the standard blood test) is a notoriously poor measure of total body magnesium status. The body tightly regulates serum levels by pulling from bone and intracellular stores when sufficient dietary intake drops. This means that by the time a deficiency shows in bloodwork, it’s usually significant, and many people never actually see it on a lab panel.
If creatine’s reputation is synonymous with gym culture, magnesium’s reputation is similarly zoomed in on relaxation or sleep. Generic claims for a generic product.
But magnesium comes in more than one form. The mineral itself is always magnesium, but the compound it’s attached to determines how it impacts the body (what tissues it reaches, and what it actually does once it gets there). Most magnesium marketing completely ignores this and, as a result, most people supplementing with magnesium are supplementing with a form that may not be addressing their primary need.
Magnesium glycinate is the form with the most clinical support for sleep and anxiety. It’s chelated with glycine — an inhibitory amino acid that itself has calming properties — which means it has two mechanisms working toward the same outcome. It’s also highly bioavailable and generally gentle on the GI tract, making it a good starting point for most people.
Magnesium citrate is another bioavailable option and typically more widely available than glycinate. It works by drawing water into the intestines, which aids absorption but also explains its stronger potential laxative effect at higher doses (something to consider before treating it as a straight swap for glycinate). That said, magnesium citrate is a reasonable general-use choice, particularly for anyone whose primary goal is basic repletion rather than targeting a specific outcome.
Magnesium malate is bound to malic acid, a compound involved in the Krebs cycle — the biochemical pathway the body uses to produce cellular energy. This form can be particularly useful for people whose primary symptoms are fatigue and muscular cramps/discomfort rather than sleep disruption. Research has shown it to be potentially beneficial for populations dealing with chronic fatigue and fibromyalgia. For high-performers running high training volumes or heavy cognitive loads, it’s a form worth considering.
Magnesium L-threonate is the only form of magnesium that has demonstrated the ability to cross the blood-brain barrier efficiently and increase brain magnesium levels. The implications are meaningful: studies have shown improvement in synaptic density and short-term memory, and early human research points toward cognitive benefits — particularly in aging populations — that other forms simply can’t replicate because they don’t reach the brain at meaningful concentrations. If cognitive performance, focus, or brain health is the goal, this is a form worth paying attention to.
Magnesium oxide is the most common form found in lower-cost supplements and many multivitamins, and is the form of magnesium most people are already taking. It has the highest elemental magnesium content per capsule, albeit poor potential bioavailability (most of it most likely isn’t absorbed). As a result, it’s the form that earns magnesium its undeserved reputation as a supplement that just gives people loose stools.
The takeaway is that the form matters when supplementing with magnesium.
For women navigating the hormonal transition of perimenopause and menopause, magnesium isn’t just foundational infrastructure — an increasingly critical lever that many practitioners aren’t addressing directly.
Here’s why it matters: estrogen actively facilitates magnesium absorption and retention. As estrogen declines during the perimenopausal transition, the body’s ability to absorb magnesium from food and supplements potentially decreases. The downstream effects of this can touch almost every symptom cluster that defines this life stage — knocking down one after the other like a domino.
Sleep is the most immediate consequence. Estrogen supports serotonin production; magnesium can support GABA regulation. When both are falling simultaneously, the nervous system has less of what it needs to down-regulate — which is why sleep disruption in perimenopause is rarely just about hot flashes.
Mood is usually impacted next, as magnesium deficiency is independently associated with increased anxiety and depression risk. Perimenopause already carries elevated risk for both. The combination produces mood instability that gets dismissed as emotional volatility rather than recognized as a physiological cascade with addressable inputs.
Bone density is the biggest long-term concern. Most people know bone loss accelerates after menopause, but fewer know that roughly 60% of the body’s total magnesium is stored in bone, and that magnesium is essential for calcium metabolism and bone-building cell activity. Low magnesium can impair the body’s ability to use calcium properly — regardless of how much calcium is being consumed.
For women in this life stage, magnesium isn’t a nice-to-have add-on. It can be one of the foundational pieces that needs to be addressed before other interventions — hormonal or otherwise — can work as intended.
The brain contains a relatively low total amount of magnesium compared to other tissues, but it’s disproportionately dependent on it. Magnesium ions act as the gatekeeper for NMDA receptors — the receptors most directly involved in learning and memory formation. When brain magnesium levels are low, NMDA receptor function is impaired, and with it the synaptic plasticity that underlies the ability to encode new information and retrieve existing knowledge.
What this looks like in practice is something akin to brain fog – not necessarily an outright impairment, but a feeling of reduced cognitive efficiency. Focus feels like something that requires more effort than it used to. Recall isn’t as sharp. The mental agility that used to feel effortless takes work.
The mood regulation piece runs through the same neurochemical terrain. Magnesium modulates cortisol, regulates GABA, and influences serotonin synthesis. Under-supply produces a low-grade emotional heaviness, elevated reactivity to stress, a narrowing of the window of tolerance. This is often described as a nervous system running a bit hotter than it should, without a clear reason.
What this looks like in practice is less complicated than the science might make it sound.
Start with magnesium glycinate in the evening. A conservative starting dose is 100-200mg for most adults, taken 30–60 minutes before bed. If GI sensitivity is a concern, start at the lower end and build. This form works with your body’s natural nighttime downregulation and will have the most immediate observable impact on sleep quality and evening anxiety. Give it two to three weeks before drawing any conclusions. You can increase to 200-400mg over time if needed or on particularly higher stress level days.
Layer magnesium L-threonate if cognitive performance is a priority. Typical recommended dosage is 1,000–2,000 mg daily, usually divided into two or three doses. You can take one of these dosages earlier in the evening (1-2 hours before bed) to support sleep and along with an afternoon dose in the afternoon to support cognition. This form is more expensive than glycinate, which is why it’s often absent from generic protocols — but if brain health, memory, and cognitive resilience are part of why you’re paying attention to this, it’s worth understanding.
Consider magnesium malate if fatigue and muscular symptoms are prominent. Morning dosing works better here because of its involvement in energy production. 300–400mg with breakfast.
Check what’s already in your stack. Many multivitamins, sleep formulas, and electrolyte blends already contain magnesium — often oxide, often in doses that don’t move the needle. Know what you’re already taking before adding more.
For women in perimenopause, magnesium glycinate can be a high-priority starting point, and the dose is worth discussing with a practitioner who understands the absorption dynamics at this life stage. If you’re taking calcium supplementation, ensure your protocol has adequate magnesium alongside it — the two minerals are metabolically interdependent in ways that the standard “calcium for bones= health” messaging can fail to address.
One final thing worth noting: magnesium is not a performance enhancer in the conventional sense. You won’t feel it the way you feel caffeine or a pre-workout. What you may notice — over time, with consistency — is a floor rising. Sleep that’s more reliably restorative. A nervous system that doesn’t run quite as hot. Muscles that recover more efficiently. A cognitive baseline that feels a little easier to maintain.
If you have questions about your supplement stack, you won’t want to miss our Supplementation 101 event tomorrow (Thursday, May 21st) at 12 PM (EST).
Coya Performance Coaches Dayna McCutchin, Kyle Gonzalez, and Liz Bouma are teaming up for an open AMA on supplementation — the concept, the context, and the considerations that should come before anything actually ends up in your cart — or in your system. Click here to save your spot.
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