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You feel tense without an obvious reason. Sleep takes a long time to come, and when it does, it doesn't last. You wake up already depleted. Before overhauling your entire routine, it may be worth asking a simpler question: is your body getting enough magnesium?
The Mineral Most People Aren't Getting Enough Of
Magnesium is an essential mineral that plays a crucial role in over 300 biochemical reactions in the human body¹, from energy production to muscle function to nervous system regulation. Globally, an estimated 2.4 billion people - roughly 31% of the global population - fail to meet the recommended magnesium intake levels². Processed and ultra-processed foods, which constitute a substantial portion of the diet in Western countries, have a significantly reduced magnesium content, with up to approximately 80% of this mineral lost during food processing, cooking, or refining³.
Its role in stress and sleep is where research is particularly compelling.
What Low Magnesium Does to Your Stress Response
Numerous studies, in both pre-clinical and clinical settings, have investigated the interaction of magnesium with key mediators of the physiological stress response, and demonstrated that magnesium plays an inhibitory role in the regulation and neurotransmission of the normal stress response⁴. When magnesium stores are low, the body becomes more reactive to stress, leading to increased cortisol production. This creates a cycle where stress depletes magnesium, and magnesium deficiency makes a person more susceptible to stress⁵.
The experience many people describe is feeling wired but tired: the mind is overstimulated, the body is depleted, and genuine recovery feels out of reach. Over time, low magnesium status has been reported in several studies assessing nutritional aspects in subjects suffering from psychological stress or associated symptoms, suggesting this deficiency can increase the risk of further health consequences⁴.
The Sleep Connection
Research suggests that magnesium helps activate the parasympathetic nervous system, responsible for relaxation and rest. It also regulates melatonin, which guides sleep-wake cycles, and binds to GABA receptors - an inhibitory neurotransmitter that quiets nerve activity⁶. When magnesium is low, the nervous system stays in a higher state of arousal at night, making it harder to fall asleep and stay asleep⁷. The signs are familiar to many: lying awake despite exhaustion, waking frequently through the night, restless or shallow sleep, muscle cramps or tension that won't release, and a restless mind in the early hours. A systematic review and meta-analysis found that, compared to placebo, magnesium supplementation reduced sleep onset latency by 17.36 minutes and extended total sleep time by 16.06 minutes, supporting the use of oral magnesium supplements for treating insomnia symptoms⁸.
It's One Piece, But It's an Important One
Stress and poor sleep are rarely caused by a single factor. Lifestyle, screen exposure, caffeine, hormonal shifts, and underlying health conditions all play a role. Magnesium deficiency is not the whole story, but for many people it represents a missing piece — magnesium is under-consumed by most people, leading to chronic deficiency and increased risk for multiple serious health conditions, such as cardiovascular disease, type 2 diabetes, and depression⁹.
Not all magnesium supplements are created equal. Different forms are absorbed and used by the body in different ways. For stress resilience, nervous system support and sleep quality, a bioavailable form matters. MetaRelax and MetaRelax Night provides magnesium in a form designed to support exactly these functions, working with the body's own recovery processes rather than overriding them.
If your sleep is suffering and your stress feels harder to manage than it should, your magnesium levels are a logical and evidence-informed place to start.
References
Acabonac Farms. Combating Magnesium Deficiency: The Role of Modern Diet and the Solution. 2023. Available at: https://www.acabonacfarms.com/blogs/in-the-kitchen/combating-magnesium-deficiency-the-role-of-moder…
Workinger JL, et al. Global Dietary Magnesium Deficiency: Prevalence, Underlying Causes, Health Consequences, and Strategic Solutions. International Journal of Vitamins and Nutrition Research. 2025. Available at: https://www.imrpress.com/journal/IJVNR/95/6/10.31083/IJVNR46828
Piuri G, et al. Magnesium — An Ion with Multiple Invaluable Actions, Often Insufficiently Supplied: From In Vitro to Clinical Research. Nutrients. 2023. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10385004/
Pickering G, et al. Magnesium Status and Stress: The Vicious Circle Concept Revisited. Nutrients. 2020;12(12):3672. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7761127/
SiPhox Health. How Do Magnesium Supplements for High Cortisol Work? 2025. Available at: https://siphoxhealth.com/articles/how-do-magnesium-supplements-for-high-cortisol-work
Nutrigram. Magnesium for Sleep: What Research Reveals About Its Effectiveness for Better Rest. 2026. Available at: https://www.nutrigram.org/magnesium-sleep-what-research-reveals-its-effectiveness-better-rest/
Mattress Nut. Magnesium Glycinate for Sleep — Does It Actually Work? 2026. Available at: https://www.mattressnut.com/magnesium-glycinate-for-sleep/
Deng X, et al. The Mechanisms of Magnesium in Sleep Disorders. PMC / NIH. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC12535714/
Wholistic Matters. Magnesium: The Forgotten Nutrient. 2024. Available at: https://wholisticmatters.com/magnesium-forgotten-nutrient/