Magnesium supplements for mental and physical health

Magnesium is one of the minerals we need in the greatest amounts, as it is incorporated into bones and involved in several hundred enzymatic processes that are essential for overall mental and physical health. Magnesium deficiency is very widespread, and because it cannot be detected using standard blood tests, the problem often goes unnoticed. This is highlighted in a review article in which researchers refer to studies showing that magnesium supplementation may be relevant for depression, insomnia, neuropathy, migraine, diabetes, high blood pressure, and several other conditions.

Magnesium is involved in more than 300 different enzymatic functions related to cellular DNA and energy metabolism, as well as the nervous system, digestion, muscles, the heart, and blood pressure regulation. Magnesium also acts as a cofactor for the important antioxidants SOD (superoxide dismutase) and GPX (glutathione peroxidase), which protect the body’s cells and tissues from damage caused by oxidative stress.
Magnesium also regulates the body’s calcium balance so that most calcium is deposited in the bones, while cells in soft tissues remain almost calcium-free. This function is particularly important, as magnesium deficiency can not only result in osteoporosis but also cause cells in soft tissues such as nerve tissue, the heart, and muscles to become flooded with calcium. This leads to overstimulation of the cells, cramping, inflammation, or cell death, with a wide range of health consequences.
In addition, magnesium plays a role in converting the form of vitamin D produced from sunlight or obtained through supplements into its active steroid form. This means that magnesium deficiency can also result in a functional deficiency of active vitamin D, for which most cells have receptors.
In the review article, the authors refer to a number of human studies showing that magnesium supplementation may be relevant for the following:

• Cognitive functions
Several studies have shown that magnesium is important for concentration and other cognitive abilities.

• Depression and anxiety
High-dosed magnesium supplementation may help counteract or alleviate depression and anxiety. This effect may be partly due to magnesium’s role in the conversion of tryptophan to serotonin. Serotonin is an important neurotransmitter that affects mood. Additional supplementation with B vitamins and zinc may enhance the beneficial effect.

• Insomnia
Supplementation with 500 mg of magnesium, preferably taken before bedtime, has shown beneficial effects on an insomnia index. Magnesium supplements may also help regulate the production of the stress hormone cortisol and the sleep hormone melatonin, both of which are important for sleep quality.

• Migraine
Supplementation with up to 600 mg of magnesium daily, preferably divided between morning and evening, has been shown to reduce the frequency of migraines as well as the intensity and duration of migraine attacks.

• Diabetes
Supplementation with 300 mg of magnesium daily has shown beneficial effects by reducing the development of diabetic neuropathy, which in severe cases can lead to amputation. Magnesium also plays a role in insulin sensitivity, and diabetes itself may increase the body’s requirement.

• Circulation, blood pressure, and bones
Magnesium reduces the risk of atherosclerosis, cardiovascular disease, and osteoporosis. This is because magnesium, as mentioned, regulates calcium distribution in the body so that most calcium is removed from the bloodstream and deposited in the bones. In addition, magnesium acts as a cofactor for the antioxidants SOD and GPX, which protect cholesterol, the cardiovascular system, and the heart from damage caused by free radicals and oxidative stress.
Magnesium supplementation may reduce the risk of high blood pressure, atrial fibrillation (heart rhythm disorders), blood clots, and heart failure. Additional supplementation with vitamin C, vitamin E, and selenium may enhance the beneficial effects on the cardiovascular system and blood pressure.
It should also be noted that calcium supplements for bone health should never be taken without also supplementing with magnesium.

Why is magnesium deficiency so overlooked?

Because most of the body’s magnesium is stored in bones and inside cells, it is not possible to measure the body’s true magnesium status using standard blood tests. Patients may therefore have normal serum magnesium levels (0.75–0.95 mmol/L) and still suffer from underlying deficiency.
We primarily obtain magnesium from a diet rich in whole grains, vegetables, nuts, and seeds. However, depleted soil, pesticides, and ultra-processing result in magnesium-poor foods. It is therefore estimated that about half of the US population does not meet the recommended daily intake of magnesium (300–400 mg), and a similar trend is seen throughout the industrialized world.
In addition, poor absorption, aging, kidney disease, diuretics, acid-reducing medications, diabetes, and stress can impair magnesium absorption and increase excretion. It is estimated that around 42 percent of young adults have an undetected deficiency.

References:

Sibtain Ahmed et al. Magnesium – The Silent Partner or the Next Vitamin D? Shifting Paradigm in Mineral Metabolism in Health and Disease. 2026

Azadehalsadat et al. The Therapeutic Effects of Magnesium in Insulin Secretion and Insulin resistance. Advanced Biomedical Research 2022

Vanderbilt University Medical Center. Why your D-vitamin supplements might not be working. ScienceDaily 2025