The Healthspan Map · Nutrient
Magnesium
Compiled by Aamir Malik, PhD, Professor of Neuroengineering at Brno University of Technology, from published studies. He is a researcher, not a physician. Last updated 21 August 2026.
Linked to getting too little
| Condition or system | Direction | Strength | Evidence type | What was found | Source |
|---|---|---|---|---|---|
| Anxiety | Eat enough of | Moderate | Systematic review | Magnesium attenuates HPA-axis activity and benefits subjective anxiety. | Boyle, Lawton & Dye 2017, Nutrients (opens in a new tab) |
| Brain fog & memory | Eat enough of | Moderate | Review / narrative | Magnesium regulates neurotransmission and synaptic plasticity; low magnesium is linked to reduced cognitive function. | Huskisson et al. 2007; micronutrient-cognition review (opens in a new tab) |
| Brain fog & memory | Eat enough of | Moderate | Review / narrative | Magnesium regulates neurotransmission and synaptic plasticity; low magnesium is linked to reduced cognitive function. | Linus Pauling Institute — Magnesium (opens in a new tab) |
| Brain fog & memory | Eat enough of | Moderate | Review / narrative | Magnesium regulates neurotransmission and synaptic plasticity; low magnesium is linked to reduced cognitive function. | Huskisson et al., "The role of vitamins and minerals in energy metabolism and well-being", J Int Med Res 2007 (opens in a new tab) |
| Chronic fatigue / low energy | Eat enough of | Moderate | Review / narrative | Magnesium is a cofactor in ATP-dependent energy metabolism; low status is linked to fatigue. | Micronutrients for energy/fatigue review (Tardy 2020) (opens in a new tab) |
| Depression / low mood | Eat enough of | Moderate | Cohort / observational | Low magnesium status is associated with depression. | NIH ODS – Magnesium (opens in a new tab) |
| Digestive discomfort | Eat enough of | Moderate | Review / narrative | Low magnesium associates with constipation; magnesium eases it osmotically. | Magnesium & constipation (opens in a new tab) |
| Headache & migraine | Eat enough of | Moderate | RCT / meta-analysis | The American Academy of Neurology/American Headache Society judge magnesium probably effective for migraine prevention. | NIH ODS – Magnesium (AAN/AHS guideline) (opens in a new tab) |
| High blood pressure | Eat enough of | Moderate | RCT / meta-analysis | Magnesium supplementation lowers blood pressure (SBP -2.8, DBP -2.1 mmHg across 38 RCTs), especially in people with hypertension. | Magnesium supplementation & BP meta (opens in a new tab) |
| Insomnia / poor sleep | Eat enough of | Moderate | RCT / trial | Magnesium calms the HPA axis (lowers cortisol), supports melatonin synthesis, and improved sleep in a primary-insomnia RCT. | Abbasi et al. 2012; melatonin-cofactor review (opens in a new tab) |
| Insomnia / poor sleep | Eat enough of | Moderate | RCT / trial | Magnesium calms the HPA axis (lowers cortisol), supports melatonin synthesis, and improved sleep in a primary-insomnia RCT. | Abbasi et al., "The effect of magnesium supplementation on primary insomnia in elderly: a double-blind placebo-controlled clinical trial", J Res Med Sci 2012 (opens in a new tab) |
| Muscle & joint pain / weakness | Eat enough of | Moderate | Systematic review | Magnesium supports muscle contraction and relaxation; inadequate intake is common in inflammatory joint pain and linked to poorer muscle performance. | Nutrition & chronic musculoskeletal pain (opens in a new tab) |
| Osteoporosis / low bone density | Eat enough of | Moderate | RCT / meta-analysis | About 67% of body magnesium sits in bone; higher intake links to greater hip/femoral-neck BMD and lower fracture risk, and magnesium is needed to activate vitamin D. | Magnesium intake & BMD/fracture meta (opens in a new tab) |
| Stress | Eat enough of | Moderate | Systematic review | Magnesium attenuates HPA-axis activity (lowers ACTH and cortisol); benefits subjective anxiety and stress. | Boyle, Lawton & Dye 2017, Nutrients (opens in a new tab) |
| Thyroid dysfunction | Eat enough of | Emerging | Mechanistic | Magnesium supports the sodium-iodide symporter that maintains iodine supply for hormone synthesis. | Minerals & thyroid review (PMC7574993) (opens in a new tab) |
| Tinnitus | Eat enough of | Emerging | Review / narrative | Magnesium supports inner-ear blood flow and may protect hair cells - emerging. | Diet & tinnitus (opens in a new tab) |
| Type 2 diabetes & metabolic syndrome | Eat enough of | Strong | RCT / meta-analysis | Higher magnesium intake is inversely associated with type 2 diabetes (per 500 mg/day OR ~0.62); magnesium is a cofactor for insulin signalling. | Glycemic index, fiber, magnesium & T2D (opens in a new tab) |
| Type 2 diabetes & metabolic syndrome | Eat enough of | Strong | RCT / meta-analysis | Higher magnesium intake is inversely associated with type 2 diabetes (per 500 mg/day OR ~0.62); magnesium is a cofactor for insulin signalling. | Association of magnesium intake with type 2 diabetes and total stroke: an updated systematic review and meta-analysis, BMJ Open 2020 (opens in a new tab) |
| Weak immunity & chronic inflammation | Eat enough of | Emerging | Review / narrative | Magnesium participates in immune activation and inflammation regulation. | Magnesium & inflammation (opens in a new tab) |
| Cardiovascular | Eat enough of | Strong | Established clinical | Deficiency causes abnormal heart rhythms and coronary spasm; low status is linked to hypertension and cardiovascular disease. | NIH ODS – Magnesium (opens in a new tab) |
Linked to getting too much
| Condition or system | Direction | Strength | Evidence type | What was found | Source |
|---|---|---|---|---|---|
| Digestive discomfort | Don't overdo | Moderate | Established clinical | Excess magnesium pulls water into the bowel, causing diarrhoea (it is used as a laxative). | NIH Office of Dietary Supplements — Magnesium (opens in a new tab) |
| Cardiovascular | Don't overdo | Moderate | Established clinical | Very high doses (laxatives/antacids or renal failure) cause hypermagnesemia → hypotension, irregular heartbeat, and, rarely, cardiac arrest (fatal cases reported). | NIH ODS – Magnesium (opens in a new tab) |
| Neurological & Mental Health | Don't overdo | Moderate | Established clinical | Hypermagnesemia causes lethargy, muscle weakness, difficulty breathing and depression. | NIH ODS – Magnesium (opens in a new tab) |
The Healthspan Map is part of Fix the Floor, a book by Aamir Malik. About the book