When searching for a magnesium supplement, it is very likely that you will encounter different forms, such as Magnesium Bisglycinate, Magnesium Citrate, and Magnesium Oxide.
They all contain magnesium, but they are not chemically identical. The form in which the magnesium is provided can affect characteristics such as solubility, absorption, and gastrointestinal tolerance.
For this reason, choosing a supplement is not just about the number of mg listed on the package. It is worth examining which form of magnesium it contains, how much elemental magnesium it provides, and what its overall composition is.
Why are there different forms of magnesium?
Magnesium is an essential mineral involved in more than 300 enzyme systems in the body. Among other things, it contributes to the normal functioning of muscles and the nervous system, normal energy metabolism, and protein synthesis.
In supplements, magnesium is bound to different compounds. This results in different forms, such as:
- Magnesium Bisglycinate
- Magnesium Citrate
- Magnesium Oxide
- Magnesium Chloride
- Magnesium Lactate
- Magnesium Malate
- and others.
The difference, therefore, does not lie in the magnesium element itself, but in the way it is delivered within the supplement.
Magnesium Bisglycinate: What is it?
Magnesium Bisglycinate is a chelated form of magnesium in which magnesium is bound to the amino acid glycine.
This is also the reason why you will often see it referred to as magnesium glycinate or magnesium bisglycinate, depending on the product's naming and raw material.
The chemical form matters, but it is not enough on its own to predict the actual performance of a product. The composition, raw material, dosage, and manufacturing method can also affect the behavior of the supplement.
Research data has shown that certain forms of magnesium can be absorbed differently than oxide. However, study results do not allow us to label one form as universally "better" for every person or every use.
What characterizes Magnesium Bisglycinate?
Chelated form
Magnesium is bound to glycine.
Common choice in modern supplements
It is widely used in products that emphasize this specific form of magnesium.
Form is not the only criterion
The quality of the raw material, the amount of elemental magnesium, and the overall composition remain important.
Magnesium Citrate: What is it?
Magnesium Citrate is the magnesium salt of citric acid.
It is one of the most widely used forms of magnesium in supplements and has been studied extensively in relation to its absorption.
In comparative studies, magnesium citrate has shown higher absorption compared to magnesium oxide. However, this does not mean it is necessarily the right choice for every person.
Tolerance, dosage, and the overall composition of the product are also important factors.
Magnesium Oxide: What is it?
Magnesium Oxide is an inorganic form of magnesium that has been used for many years in supplements.
One of its features is that it provides a relatively high amount of elemental magnesium relative to the total weight of the compound.
However, high elemental magnesium content does not automatically mean higher absorption.
Oxide has lower solubility than some other forms of magnesium, and comparative studies have shown lower absorption compared to forms such as citrate.
Bisglycinate, Citrate, or Oxide?
There is no simple answer like "this is the best form."
The three forms have different characteristics:
This comparison should be read as a comparison of characteristics and not as a ranking.
The appropriate choice depends on the product, the dosage, the tolerance, and the needs of each individual.
What does "elemental magnesium" mean?
This is one of the most important points you need to know when comparing supplements.
The compound inside the capsule does not consist solely of magnesium.
For example, Magnesium Bisglycinate includes magnesium and the rest of the chemical compound, while Magnesium Oxide consists of magnesium and oxygen.
Therefore:
Magnesium Bisglycinate ≠ amount of elemental magnesium
and
Magnesium Oxide ≠ amount of elemental magnesium.
When you compare two supplements, what is of particular importance is how many mg of elemental magnesium the daily dose provides.
For this reason, do not look only at the large letters on the front of the packaging. Check the nutritional information table and the recommended daily dose.
Magnesium absorption: Why does the form matter?
Magnesium absorption does not depend solely on the name of the form.
Solubility, chemical binding, dosage, product composition, and other factors can influence how much magnesium is available for absorption.
Some forms of magnesium that dissolve better in liquid tend to be absorbed more fully than less soluble forms, while comparative studies have shown differences between different compounds.
At the same time, results can vary depending on the specific raw material and the product's composition.
Therefore, the name of the form is important—but it doesn't tell the whole story.
How to choose a magnesium supplement?
Before choosing a product, it is worth checking five key points.
1. Which form of magnesium does it contain?
See if it is Bisglycinate, Citrate, Oxide, or another form.
2. How much elemental magnesium does it provide?
This is particularly useful when you are comparing different products.
3. What is the daily dose?
Do not just compare the mg per capsule. Check how many capsules make up the recommended daily dose.
4. What else does the formula contain?
Check the remaining ingredients, additives, and the overall composition of the product.
5. What is the origin and quality of the raw material?
The specific raw material and the production process are also part of a supplement's overall quality.
How much magnesium do we need daily?
Magnesium needs vary by age and gender.
According to the EFSA, the Adequate Intake (AI) for adults is:
- 350 mg per day for men
- 300 mg per day for women
These values refer to total dietary intake and not exclusively magnesium from supplements.
👉 How Much Magnesium Do We Need Per Day? A Guide for Adults
What does magnesium do in the body?
Magnesium participates in many physiological processes.
In the European Union, when a food or supplement meets the requirements to be at least a source of magnesium, approved health claims for magnesium can be used.
Among other things, magnesium contributes to:
- normal muscle function,
- normal nervous system function,
- normal energy metabolism,
- the reduction of tiredness and fatigue,
- normal protein synthesis,
- the maintenance of normal bones and teeth.
These specific claims are used in accordance with the requirements set by the European regulatory framework.
Magnesium Bisglycinate at PHYSISWELL
At PHYSISWELL, the choice of magnesium form is a key part of the formula's philosophy.
PHYSISWELL Magnesium Bisglycinate contains magnesium in the form of Magnesium Bisglycinate and vitamin B6 in the form of P-5-P.
The formula is designed with an emphasis on clear composition, transparent labeling of active ingredients and the amount of elemental magnesium, as well as a clean label approach.
The magnesium in the formula comes from European raw material, with an emphasis on transparency and raw material quality.
👉 Discover the PHYSISWELL Magnesium Bisglycinate formula
Conclusion
Magnesium Bisglycinate, Magnesium Citrate, and Magnesium Oxide are different forms of the same basic mineral, but they have different characteristics in terms of their chemical form, solubility, and absorption.
Bisglycinate is a chelated form with glycine.
Citrate is a form that has been studied extensively and exhibits good solubility.
Oxide provides a high ratio of elemental magnesium, but has lower solubility and, in several comparative studies, lower absorption than some other forms.
The most important thing is to not look only at the name of the form or a large number of mg on the package.
Look at the form, the elemental magnesium, the daily dose, the overall composition, and the quality of the raw material.
This is how you can compare a magnesium supplement in a more meaningful way.
Sources
1. EFSA – Dietary Reference Values for Magnesium and Phosphorus
2. NIH Office of Dietary Supplements – Magnesium Fact Sheet
3. European Commission – EU Register of Health Claims
4. EUR-Lex – Commission Regulation (EU) No 432/2012
5. PubMed – Comparative studies on magnesium bioavailability