Magnesium
Essential mineral supporting energy metabolism and muscle function.
Magnesium is an essential trace element that participates in more than 300 biochemical reactions in the body, including nerve transmission, muscle relaxation after contraction, bone and tooth formation, and energy production. It is present in many foods and mineral waters and is supplied in supplements as salts such as citrate, oxide, chloride and lactate.
Dietary intake is often insufficient for some people, so supplementation is commonly used to support normal energy metabolism, to help reduce fatigue and to maintain muscle and nervous system function; individual responses vary. Supplements come as powders, tablets, capsules and combined formulas, and safety considerations—particularly impaired kidney function—should guide use.
At a Glance
Present as a common dietary mineral and elemental ion, magnesium is involved in hundreds of biochemical reactions and occurs naturally in soil, water, plants and animals.
It supports energy metabolism, helps maintain muscle and nerve function, and contributes to the maintenance of bones and teeth; it is supplied by foods and by various supplemental salt forms.
Dietary intake may be insufficient for some people, so multiple supplement formats are available and individual needs and safety (notably kidney function) should guide use.
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| Scientific name | Mg |
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Origin & History
Magnesium is a naturally occurring chemical element widely distributed in the environment; it occurs in soil, mineral and fresh waters, in plants and algae, and in animal tissues, typically as a component of various mineral salts. Common food sources include seeds, legumes, whole grains, certain vegetables, seafood and mineral water.
Early chemists recognised magnesium as a distinct element and it was subsequently isolated and incorporated into the periodic classification; its salts occur in many mineral forms and have been extracted for varied uses. Historically, magnesium-containing minerals were prized in mineral springs and used in traditional preparations as well as for agricultural and material applications.
Composition & Active Compounds
Magnesium commonly appears in supplement form as white powders of various mineral salts derived from the elemental magnesium ion; these salts include citrate, oxide, chloride, carbonate, hydroxide, glycerophosphate and lactate. The active component in each compound is the Mg2+ ion, with each salt differing in solubility and pharmacotechnical properties.
Magnesium salts such as citrate and oxide are commonly used in supplements.
- Citrate: magnesium bound to citric acid, used for oral supplements and noted for good solubility
- Oxide: concentrated magnesium salt used in tablets and powders
- Chloride: soluble magnesium salt found in oral solutions and topical uses
- Carbonate: magnesium combined with carbonate, used in some supplement and antacid formulations
- Hydroxide: basic magnesium salt present in antacid and laxative products
- Glycerophosphate: organic magnesium salt used in certain mineral delivery formulations
- Lactate: magnesium combined with lactic acid, included in some supplement preparations
Properties & Effects
Magnesium is traditionally known as an essential mineral involved in many metabolic reactions and as a regulator of muscle and nervous system activity.
Intake of magnesium is well documented to contribute to normal energy metabolism and to help reduce feelings of fatigue.
- Energy metabolism and fatigue: may support normal energy production and help reduce fatigue.
- Muscle relaxation and cramps: may support muscle relaxation after contraction and reduce the frequency or intensity of cramps.
- Nervous system function: may support normal nerve transmission and psychological function.
- Bone and dental maintenance: may contribute to the maintenance of bones and teeth.
- Electrolyte balance: may help maintain fluid and electrolyte balance in the body.
- Premenstrual symptoms: research suggests it may help reduce menstrual discomfort for some individuals.
- Migraine support: some studies suggest supplementation may reduce the frequency or intensity of migraine attacks for certain people.
Dosage & How to Use
Recommended intake values are provided to guide dietary magnesium needs and may vary with age, body composition and physiological conditions.
| Men | 420 mg/day |
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| Women | 360 mg/day |
Safety, Side Effects & Contraindications
Magnesium supplements should be used with caution in people with impaired kidney function because the kidneys are responsible for clearing excess magnesium; reduced renal function can increase the risk of accumulation and adverse effects. Consult a healthcare professional before starting supplementation if there are existing medical conditions or concurrent medications.
Common side effects at higher intakes include laxative effects and gastrointestinal upset; excessive magnesium in the blood (hypermagnesemia) is uncommon but can cause symptoms such as low blood pressure, muscle weakness and other neuromuscular difficulties. Individual tolerance varies and dosing should consider overall intake from food and supplements.
- Renal insufficiency: the use of magnesium supplements is contraindicated for patients with impaired kidney function.
- Hypermagnesemia risk: excess magnesium can lead to laxative effects, hypotension and muscle weakness and should be avoided or monitored in at-risk individuals.
Avoid magnesium supplements if you have impaired kidney function and consult a healthcare professional before use, especially if taking medications or managing a chronic condition.