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Magnesium is an essential mineral, and a magnesium deficiency can lead to fatigue, cramps, irritability, and other discomforts. However, there are many forms of magnesium available as food supplements, each with different absorption and tolerance properties.
Should you choose marine magnesium or bisglycinate? Magnesium citrate or magnesium glycerophosphate?
Here's a guide to help you choose the magnesium that best suits your needs. We'll explain the differences!
The importance of magnesium for the body
Magnesium plays a crucial role in over 300 enzymatic reactions in the nervous system, muscles, and the body in general. A magnesium deficiency can manifest as:
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Cramps and muscle tension.
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A state of nervousness or constant fatigue.
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Difficulty concentrating.
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Sleep disorders.
Unfortunately, modern diets do not always cover the recommended daily intake of magnesium. This is why magnesium supplementation may be necessary, especially in cases of identified magnesium deficiency (for example, through a blood test or following medical advice).
The main forms of magnesium
There are different forms of magnesium on the market. Not all are equal in terms of bioavailability, digestive tolerance, or long-term effectiveness. Here are a few:
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Magnesium from sea lettuce
Derived from the Ulva lactuca alga, this magnesium is a natural alternative to synthetic forms. It offers good bioavailability while providing other essential minerals and nutrients. -
Magnesium bisglycinate
Considered a chelated form, bisglycinate combines magnesium with amino acids (glycine). This structure promotes intestinal absorption and limits the risk of digestive discomfort. It is one of the forms often recommended to optimize bioavailability and digestive tolerance. -
Magnesium citrate
Citrate is a form frequently used in food supplements. Thanks to its acidic pH, it promotes magnesium absorption in the stomach. Magnesium citrate is known for its mild laxative effect, which can be an advantage for some people prone to constipation, but less appreciated by others. -
Magnesium glycerophosphate
This form is interesting for its good digestive tolerance and correct bioavailability. Magnesium glycerophosphate is sometimes recommended for people who experience stomach upset with other forms of magnesium. -
Magnesium chloride
Present in marine magnesium, magnesium chloride is known for its laxative properties. It is easy to find but can cause digestive discomfort in sensitive individuals. -
Magnesium malate
Malate is formed by combining magnesium with malic acid, a compound found in fruits. It can contribute to cellular energy production and support muscle function, while offering good tolerance.
Marine magnesium or bisglycinate: which to choose?
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Magnesium from sea lettuce:
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Advantages: Natural source, good bioavailability, rich in other minerals and nutrients, less irritating than some inorganic forms.
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Disadvantages: Possible laxative effect, marine taste and smell.
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Magnesium bisglycinate:
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Advantages: Excellent bioavailability, chelated form, high digestive tolerance, fewer risks of intestinal disorders.
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Disadvantages: Generally higher cost than other forms.
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The choice will therefore depend on your priorities. For optimal digestive comfort, magnesium bisglycinate is often recommended. If you are looking for a natural form and tolerate inorganic salts well, marine magnesium may be suitable.
Magnesium citrate or bisglycinate?
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Magnesium citrate:
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Strengths: Good absorption, potentially helps regulate transit for constipated individuals.
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Weaknesses: May increase the risk of diarrhea or digestive discomfort if the dosage is high.
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Magnesium bisglycinate:
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Strengths: Chelated form, few side effects, ideal for people seeking maximum absorption.
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Weaknesses: Higher cost, lower availability in some food supplement ranges.
The role of vitamin B6 and amino acids
Some magnesium formulas include vitamin B6 to optimize magnesium fixation in the body and to support the nervous system. This is the case with our ZMB supplement, composed of magnesium pidolate, zinc, and vitamin B6. It is ideal for reducing fatigue and promoting muscle and nervous relaxation.
Similarly, amino acids (in the context of a chelated form like bisglycinate) improve magnesium absorption and utilization.
How to choose your magnesium?
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Identify digestive tolerance: If you have a sensitive gut, opt for chelated forms (bisglycinate, glycerophosphate) or malate to limit the risk of diarrhea.
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Consider your objectives: Do you need an effect on muscle relaxation, energy, or transit regulation? Each form of magnesium has different specificities.
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Check the quality of the supplement: Choose a reliable brand that clearly indicates the amount of elemental magnesium, the form used, and, if possible, the presence of other nutrients like vitamin B6.
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Adjust the dosage: In cases of confirmed magnesium deficiency, a higher magnesium supplementation may be necessary, under the supervision of a healthcare professional.
Conclusion
The choice of magnesium largely depends on your supplementation goal and your digestive tolerance. For daily use and good absorption, magnesium bisglycinate is often considered one of the best solutions.
However, other forms of magnesium such as marine magnesium, magnesium citrate, or magnesium malate may be more suitable depending on your specific needs and health profile.
If in doubt, do not hesitate to seek the advice of a healthcare professional, especially if you suspect a magnesium deficiency or suffer from particular conditions.

