Quick Summary

Magnesium chloride is a compound that provides magnesium, an essential mineral involved in numerous biochemical processes within the human body. According to the Dietary Supplement Fact Sheet by the National Institutes of Health Office of Dietary Supplements (NIH ODS), magnesium plays vital physiological roles, although unique claims specific to the chloride salt form are not distinguished in currently available evidence.

What is it?

Magnesium chloride is an inorganic salt composed of magnesium and chloride ions. It is one of several common supplemental forms of magnesium, used to increase magnesium intake when diet alone is insufficient. Magnesium itself is an essential mineral required by the body for various biological functions.

Main Functions in the Body

  • Supports enzyme activities involved in energy metabolism.
  • Contributes to proper muscle contraction and nerve transmission.
  • Plays a role in bone structure and maintenance.

These functions pertain to magnesium in general, not uniquely to magnesium chloride.

Recommended Intake and Upper Limit

Recommended Dietary Allowances (RDAs) or Adequate Intakes (AIs) for magnesium vary according to age, sex, and life stage. These values are established based on total elemental magnesium intake regardless of the chemical salt form (e.g., magnesium chloride, oxide, citrate). Tolerable Upper Intake Levels (ULs) apply to supplemental magnesium intake to help avoid adverse effects and are not specifically defined for magnesium chloride.

For detailed guidance, refer to authoritative dietary reference intakes available from national health bodies such as the NIH Office of Dietary Supplements.

Best Food Sources

Magnesium is naturally available in many foods, including:

  • Green leafy vegetables (e.g., spinach, kale)
  • Nuts and seeds (e.g., almonds, pumpkin seeds)
  • Whole grains (e.g., brown rice, whole wheat)
  • Legumes (e.g., black beans, lentils)

Deficiency: Causes, Symptoms and Risk Groups

Magnesium deficiency may arise due to insufficient dietary intake or conditions impairing absorption or increasing excretion. Risk groups include:

  • Individuals with gastrointestinal diseases affecting absorption
  • People with type 2 diabetes
  • Those with alcohol dependence
  • Older adults

Signs and symptoms of magnesium deficiency often include muscle cramps, weakness, fatigue, and cardiac arrhythmias. Management focuses on correcting magnesium levels rather than treating deficiency attributed to any particular salt form such as magnesium chloride.

Supplement Forms

Magnesium chloride is one of several forms of magnesium supplements available, alongside others like magnesium oxide, citrate, sulfate, and glycinate. These differ primarily in their chemical composition, solubility, and bioavailability.

Absorption and Bioavailability

Magnesium chloride is generally regarded as a more bioavailable supplemental form compared to magnesium oxide, largely due to its higher solubility. However, direct comparative data with other forms such as citrate or glycinate are limited in the supplied evidence.

No specific enhancers or inhibitors of magnesium chloride absorption were identified in the evidence reviewed.

Potential Benefits: What Does the Evidence Say?

Correction of magnesium deficiency and maintenance of magnesium-dependent physiological functions:

Magnesium is an essential nutrient with well-established roles in enzyme function, cardiovascular health, and neuromuscular function. Supplementation with magnesium chloride may be used to restore magnesium levels in deficient individuals. However, evidence does not distinguish unique clinical benefits attributable solely to magnesium chloride compared to other magnesium salts.

Side Effects and Toxicity

  • Mild laxative effects and gastrointestinal discomfort may occur with magnesium chloride supplements, especially at higher doses.
  • Excessive magnesium intake from supplements can lead to hypermagnesemia, particularly in individuals with impaired kidney function.

Supplemental magnesium intake should remain within established upper intake levels to minimize risk of adverse effects. No unique upper intake limits have been defined for magnesium chloride.

People with kidney disease or impaired renal function should approach magnesium supplementation cautiously and only under healthcare supervision.

Drug and Nutrient Interactions

Currently, no specific drug or nutrient interactions related uniquely to magnesium chloride have been identified in the available evidence. As with other magnesium supplements, potential interactions may exist and should be discussed with a healthcare professional.

Who Should Be Careful?

  • Individuals with kidney disease or impaired renal function should consult healthcare providers before using magnesium supplements, including magnesium chloride.
  • People who are pregnant or breastfeeding should seek professional advice before supplementation.
  • Anyone with chronic medical conditions or who uses regular medication should discuss magnesium supplementation with their healthcare provider to avoid potential interactions or adverse effects.

Frequently Asked Questions

Is magnesium chloride better than other magnesium supplements?
Magnesium chloride has relatively good bioavailability and solubility compared to some other forms like magnesium oxide. However, evidence does not conclusively show that it is superior to all other forms for every use.
Can magnesium chloride cause side effects?
At higher doses, magnesium chloride supplements can cause mild gastrointestinal discomfort or a laxative effect. Excessive intake should be avoided.
Can anyone take magnesium chloride supplements safely?
While many people tolerate magnesium chloride well, those with kidney problems or other health issues should consult a healthcare professional before using it.
Are there any EU-authorized health claims for magnesium chloride?
No specific EU-authorized claims for magnesium chloride supplementation were identified in the current evidence.

Evidence Limitations

  • No specific clinical trial data or meta-analyses on magnesium chloride were available to support unique claims or benefits beyond those established for elemental magnesium.
  • There is no differentiation in effects, dosing, or safety profile specific to magnesium chloride versus other magnesium salts in the supplied information.
  • EU-authorized health claims for magnesium chloride supplements were not found in the reviewed sources.

References

Disclaimer

This page provides general information based on currently available evidence and is not intended to replace professional medical advice. Individuals who are pregnant, breastfeeding, have medical conditions such as kidney or thyroid disease, iron overload disorders, or use medications should consult a healthcare professional before starting any mineral supplementation including magnesium chloride.

Last Reviewed

June 2024