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Each capsule delivers 150 mg of elemental magnesium from 967.7 mg of magnesium citrate (citrate de magnesium / citrato de magnesio) one of the most bioavailable and well tolerated forms of supplemental magnesium. Magnesium citrate is a chelated compound formed by bonding elemental magnesium to citric acid, improving solubility and gastrointestinal tolerability compared to inorganic forms such as magnesium oxide. 

Why Magnesium Citrate?

Magnesium oxide has high elemental magnesium content by weight but poor bioavailability absorption rates as low as 4% and commonly causes loose stools through osmotic action in the colon. Magnesium citrate, as a chelated organic acid salt, is absorbed more efficiently in the small intestine, leaving less unabsorbed magnesium to reach the colon. Each 967.7 mg of magnesium citrate provides 150 mg of elemental magnesium the biologically active form that participates in enzymatic reactions throughout the body.

Energy Metabolism

ATP the cell’s primary energy currency must be bound to magnesium to be biologically active. Magnesium is a required cofactor for over 300 enzymatic reactions, including those governing glycolysis, the citric acid cycle, and oxidative phosphorylation the three core pathways of cellular energy metabolism. Adequate magnesium is essential for the body’s ability to produce and utilize cellular energy.

Bone, Muscle & Electrolyte Support

Approximately 60% of the body’s magnesium is stored in bone, where it is required for vitamin D activation which in turn regulates intestinal calcium absorption and bone mineralization. Calcium triggers muscle contraction; magnesium enables muscle relaxation by competing with calcium at binding sites and supporting calcium reuptake into the sarcoplasmic reticulum. As a primary intracellular electrolyte, magnesium supports the sodium-potassium ATPase pump, nerve signal transmission, and neuromuscular coordination.

Magnesium Citrate 150mg | Elemental Magnesium | Energy Metabolism and Bone Health | 120 Vcaps

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Health Canada Licensed Natural Health Product (NPN 80143268)

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Each capsule delivers 150 mg of elemental magnesium from 967.7 mg of magnesium citrate (citrate de magnesium / citrato de magnesio) one of the most bioavailable and well tolerated forms of supplemental magnesium. Magnesium citrate is a chelated compound formed by bonding elemental magnesium to citric acid, improving solubility and gastrointestinal tolerability compared to inorganic forms such as magnesium oxide. 

Why Magnesium Citrate?

Magnesium oxide has high elemental magnesium content by weight but poor bioavailability absorption rates as low as 4% and commonly causes loose stools through osmotic action in the colon. Magnesium citrate, as a chelated organic acid salt, is absorbed more efficiently in the small intestine, leaving less unabsorbed magnesium to reach the colon. Each 967.7 mg of magnesium citrate provides 150 mg of elemental magnesium the biologically active form that participates in enzymatic reactions throughout the body.

Energy Metabolism

ATP the cell’s primary energy currency must be bound to magnesium to be biologically active. Magnesium is a required cofactor for over 300 enzymatic reactions, including those governing glycolysis, the citric acid cycle, and oxidative phosphorylation the three core pathways of cellular energy metabolism. Adequate magnesium is essential for the body’s ability to produce and utilize cellular energy.

Bone, Muscle & Electrolyte Support

Approximately 60% of the body’s magnesium is stored in bone, where it is required for vitamin D activation which in turn regulates intestinal calcium absorption and bone mineralization. Calcium triggers muscle contraction; magnesium enables muscle relaxation by competing with calcium at binding sites and supporting calcium reuptake into the sarcoplasmic reticulum. As a primary intracellular electrolyte, magnesium supports the sodium-potassium ATPase pump, nerve signal transmission, and neuromuscular coordination.

Supplement Facts

Supplement Facts

Serving Size: 1 Capsule

Servings Per Container: 120

Ingredient
Amount Per
Serving
% Daily
Value
Magnesium (from Magnesium Citrate 967.7mg)
150 mg
36%

Based on a 2,000 calorie diet. Daily Value based on 420mg for adults 19+

Other Ingredients:
Hypromellose (Vegetable Capsule Shell), Magnesium Stearate

Clinical Research

Magnesium and human health: perspectives and research directions

International Journal of Endocrinology, 2018

This comprehensive review examined the physiological roles of magnesium across multiple organ systems, documenting its role as a cofactor in over 300 enzymatic reactions including ATP synthesis, DNA replication, and protein synthesis. The review confirmed that magnesium is essential for energy metabolism, bone mineral formation, muscle function, and nerve signal transmission, and that magnesium deficiency is associated with impaired energy production, reduced bone density, and muscle dysfunction. The authors concluded that magnesium citrate is among the most bioavailable and well tolerated forms for supplementation.

Bioavailability of magnesium salts a review

Journal of Pharmacy and Pharmacology, 2001

This comparative bioavailability study examined the absorption of multiple magnesium salt forms including magnesium citrate, magnesium oxide, magnesium chloride, and magnesium gluconate in human subjects. The study found that magnesium citrate had significantly higher bioavailability than magnesium oxide, with urinary magnesium excretion (a marker of absorption) significantly higher in the citrate group. The authors concluded that magnesium citrate is one of the most bioavailable forms of supplemental magnesium and is preferred over inorganic forms for supplementation.

Magnesium and bone: a review

Nutrients, 2021

This systematic review examined the relationship between magnesium status and bone health, documenting magnesium's roles as a structural component of bone mineral, a cofactor for vitamin D activation, and a regulator of parathyroid hormone and calcium metabolism. The review found consistent evidence that adequate magnesium intake supports bone mineral density and reduces fracture risk, and that magnesium deficiency impairs vitamin D activation and calcium metabolism even when calcium intake is adequate. The authors concluded that magnesium is an essential co nutrient for bone health alongside calcium and vitamin D.

Research information is provided for educational purposes and does not replace the product's approved label information.

Frequently Asked Questions

What is magnesium citrate and what is it used for?

Magnesium citrate is a chelated form of magnesium elemental magnesium bonded to citric acid providing enhanced bioavailability and gastrointestinal tolerability compared to inorganic forms such as magnesium oxide. Magnesium citrate is a factor in the maintenance of good health, helps in energy metabolism and tissue formation, supports the development and maintenance of bones and teeth, helps maintain normal muscle function including the heart muscle, helps maintain the body's ability to metabolize nutrients, and is a source of electrolytes.

What is the difference between magnesium citrate and magnesium oxide?

Magnesium oxide is an inorganic form of magnesium with low bioavailability (approximately 4%) and a high likelihood of causing gastrointestinal discomfort and loose stools at supplemental doses. Magnesium citrate is a chelated form with significantly higher bioavailability and better gastrointestinal tolerability, making it one of the most widely used and well-studied forms of supplemental magnesium. Magnesium citrate provides 150mg of elemental magnesium per 967.7mg of the compound a high elemental yield in a bioavailable form.

How does magnesium support energy metabolism?

ATP (adenosine triphosphate) the cell's primary energy currency must be bound to magnesium to be biologically active. Virtually every ATP dependent reaction in the body requires magnesium as a cofactor. Magnesium is also required for the enzymatic reactions of glycolysis, the citric acid cycle, and oxidative phosphorylation the three core pathways of cellular energy metabolism. Without adequate magnesium, the body's capacity to produce and utilize cellular energy is impaired.

How does magnesium support bone health?

Magnesium is a structural component of bone mineral approximately 60% of the body's magnesium is stored in bone. Magnesium is also required for the activation of vitamin D (which regulates calcium absorption) and for the regulation of parathyroid hormone, which governs calcium metabolism. Adequate magnesium supports the development and maintenance of bones and teeth alongside calcium and vitamin D. Magnesium deficiency impairs both vitamin D activation and calcium metabolism, undermining bone health even when calcium intake is adequate.

How does magnesium support muscle function?

Calcium triggers muscle contraction; magnesium enables muscle relaxation by competing with calcium at binding sites and supporting the active transport of calcium out of muscle cells. This calcium magnesium balance governs normal skeletal and cardiac muscle performance. Adequate magnesium supports normal muscle function, reduces muscle tension and cramps, and supports healthy heart rhythm. Magnesium deficiency is a common cause of muscle cramps and spasms.

Can magnesium citrate cause diarrhea?

High dose magnesium supplementation can cause loose stools or diarrhea in some individuals this is a known property of magnesium at doses that exceed the intestine's absorption capacity. Magnesium citrate has better gastrointestinal tolerability than inorganic forms such as magnesium oxide, but diarrhea may still occur at higher doses. If this happens, reduce the dose. Taking with food further reduces the likelihood of gastrointestinal discomfort.

What is elemental magnesium and why does it matter?

Elemental magnesium is the biologically active magnesium ion the form that participates in enzymatic reactions and physiological processes in the body. The compound weight (967.7mg magnesium citrate) includes both the magnesium and the citrate carrier. The elemental magnesium content (150mg per capsule) is the meaningful dose figure it tells you how much actual magnesium you are getting, not how much of the compound. Always compare elemental magnesium content when comparing magnesium supplements.

Who should not take magnesium citrate?

Consult a healthcare practitioner before use if you have kidney disease, are pregnant or breastfeeding, or are taking medications including blood pressure medications, antibiotics (tetracyclines and fluoroquinolones), or bisphosphonates (magnesium may affect absorption of these medications). Keep out of reach of children.