Deep Dive for Magnesium
A closer look at its forms, biological roles, and what to consider when choosing a magnesium supplement.
What Is
Magnesium?
Magnesium is an essential mineral involved in hundreds of enzyme systems in the human body. It contributes to normal muscle and nerve function, energy metabolism, electrolyte balance, protein synthesis, and the maintenance of normal bones.
Common Forms
of Magnesium
Supplemental magnesium is available in several forms. They differ in the compound bound to magnesium, elemental magnesium content, absorption characteristics, and gastrointestinal tolerance.
Magnesium Citrate
Magnesium bound to citric acid. It is commonly used in supplements and can have a laxative effect at higher doses.
Magnesium Glycinate
Magnesium combined with glycine. This form is commonly selected when gastrointestinal tolerance is an important consideration.
Magnesium Malate
Magnesium combined with malic acid, an organic acid involved in cellular energy metabolism.
Magnesium L-Threonate
A form combining magnesium with threonic acid. It has been investigated in research involving magnesium delivery and neurological outcomes.
Magnesium Taurate
Magnesium combined with the amino-sulfonic acid taurine. Research on this particular supplemental form remains comparatively limited.
Magnesium Oxide
A form with a relatively high proportion of elemental magnesium by weight but comparatively lower fractional absorption than several organic magnesium salts.
Magnesium Chloride
Magnesium chloride is used in oral products and is also commonly found in topical preparations and bath products.
Key Roles
of Magnesium
- Contributes to normal muscle function
- Contributes to normal nervous-system function
- Participates in normal energy-yielding metabolism
- Contributes to electrolyte balance
- Helps maintain normal bones
- Participates in protein synthesis
- Functions as a cofactor for numerous enzymes
How to Choose
Consider what matters to you:
Formulation: Different magnesium compounds have different elemental magnesium concentrations and absorption characteristics.
Digestive tolerance: Some forms are more likely than others to produce gastrointestinal effects.
Elemental magnesium: Compare the amount of actual magnesium per serving rather than only the total weight of the magnesium compound.
Other ingredients: Check whether the formulation contains additional active ingredients, fillers, flavors, or sweeteners.
Quality: Look for transparent sourcing, manufacturing information, and appropriate quality testing.
Other Factors to Consider
- Check the elemental magnesium amount per serving.
- Compare the recommended serving size between products.
- Look for appropriate identity, purity, and contaminant testing.
- Consider digestive tolerance when comparing forms.
- Review other active and inactive ingredients.
- Consider medications and health conditions before supplementation.
Key Takeaway
“Magnesium” does not describe a single supplement formulation. Products can differ in the magnesium compound used, elemental magnesium per serving, dosage, other ingredients, absorption characteristics, and gastrointestinal tolerance. Understanding those differences makes product labels much easier to compare.
Before Supplementing
Supplemental magnesium can cause diarrhea, nausea, or abdominal cramping, particularly at higher supplemental doses. Magnesium can also interact with certain medicines. People with impaired kidney function or other medical conditions should discuss supplementation with a qualified healthcare professional.
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