Reviewed by:
Dr. Patricia Núñez de Aysa — Medical expert in Longevity, specialist in Rehabilitation and Traumatology without surgery.
Dr. Joel Cuesta Gascón — Medical expert in sports medicine, rehabilitation, and nutrition.
Last updated: May 2026.
In 30 seconds
- Magnesium is an essential mineral involved in over 300 bodily reactions: energy, nervous system, muscle function, and rest.
- Not all types of magnesium are equal: bisglycinate, citrate, malate, taurate, threonate, and oxide have distinct absorption and use profiles.
- For daily use, bisglycinate stands out for its digestive tolerance. For more complete formulas, combining several types works best.
- Consistency matters more than exact dosage: magnesium works as a habit, not as a quick fix.
What is magnesium and why is it more important than it seems?
Magnesium is one of the most underrated minerals in nutrition. It participates in over 300 enzymatic reactions in the human body and is involved in basic functions such as producing energy, transmitting nerve impulses, contracting and relaxing muscles, and synthesizing proteins.
Despite its importance, most of the European population does not reach the recommended intake through diet. The main reason: our routines have moved away from magnesium-rich foods (legumes, nuts, seeds, leafy green vegetables), and chronic stress increases its cellular consumption.
Understanding what magnesium does, what happens when it's lacking, and which type to choose is the basis for making good supplementation decisions.
What magnesium is for: key functions
The European Food Safety Authority (EFSA) recognizes several health claims associated with magnesium. These are the functions that have the most impact on daily life.
Energy and fatigue reduction
Magnesium is involved in normal energy metabolism and helps reduce tiredness and fatigue. It is a cofactor in the production of ATP, the molecule the body uses as "energy currency." When levels are low, feelings of exhaustion, lack of sparkle, and poor physical performance appear more easily.
Muscle function and recovery
Magnesium regulates muscle contraction and relaxation. That's why it is so often associated with cramps, overload, spasms, or a feeling of tight muscles. In active people or athletes, adequate intake promotes recovery after exertion.
Nervous system and rest
Magnesium contributes to the normal functioning of the nervous system and normal psychological function. It modulates the stress response, helps regulate cortisol, and facilitates the transition to rest. It is not a sedative, but it does facilitate physiological disconnection.
Protein synthesis and bones
Magnesium is involved in protein synthesis and the maintenance of normal bones and teeth. Along with vitamin D and vitamin K2, it forms part of the trifecta that has the most impact on adult bone health.
Symptoms of magnesium deficiency
Magnesium deficiency is rarely detected in routine blood tests because only 1% of the body's magnesium is in the blood. Most of it is inside cells. That's why many people with compatible symptoms receive "normal" test results.
The most frequent signs of insufficient intake are:
- Persistent tiredness with no clear cause
- Cramps, muscle contractures, eye twitching, or a feeling of tight muscles
- Difficulty sleeping or frequent awakenings during the night
- Increased irritability or sensitivity to stress
- Headaches or tension-type pain
- Occasional constipation
- More intense premenstrual syndrome
It's not a diagnosis, but it is a signal to review your intake and, if it fits your context, consider supplementation.
Magnesium-rich foods
Before supplementing, it is advisable to review your diet. Foods with the highest magnesium content are:
| Food | Approx. Magnesium per 100 g |
|---|---|
| Pumpkin seeds | 535 mg |
| Almonds | 270 mg |
| Cashews | 250 mg |
| Pure cocoa (>85%) | 230 mg |
| Cooked spinach | 80 mg |
| Avocado | 30 mg |
| Banana | 27 mg |
The recommended daily intake for adults is 300-420 mg, depending on age, sex, and activity level.
Types of magnesium: which is best depending on the goal
Here's the most asked question on Google. And the short answer is: there is no "best magnesium"; there is the best for each goal and each person.
Magnesium bisglycinate
Magnesium bisglycinate links the mineral to two glycine molecules. It is the form with the best intestinal absorption and digestive tolerance. Glycine also has a calming effect on the nervous system.
Ideal for: continuous daily use, rest, muscle relaxation, people with sensitive digestion.
Magnesium malate
Malate combines magnesium with malic acid, a compound involved in the cellular energy cycle. This is why it is often preferred in strategies focused on energy and muscle function.
Ideal for: daytime use, muscle recovery, physical fatigue, athletes.
Magnesium taurate
Taurate links magnesium with taurine, an amino acid related to the cardiovascular and nervous systems. It is a less common but very interesting form in global wellness formulations.
Ideal for: cardiovascular health, nervous system regulation, general well-being.
Magnesium citrate
Citrate has good solubility and acceptable absorption. Its main drawback is that it can have a laxative effect in some people, which makes it useful if there is a tendency to constipation, but less comfortable for continuous daily use.
Ideal for: intestinal transit support, occasional use.
Magnesium threonate
L-threonate is the form with the most preliminary evidence for cognitive function, as it crosses the blood-brain barrier better. The problem: it requires high doses to provide useful elemental magnesium.
Ideal for: mental focus, cognitive function, although its cost is high.
Magnesium oxide
It is the cheapest form and the most used in low-cost supplements. Its absorption is low (around 4%) and its digestive tolerance is fair. Useful for correcting a specific deficiency economically, but not the best option if you are looking for a sustained effect.
Ideal for: low-cost option; not recommended for continuous use.
Summary table: magnesium types compared
| Type | Absorption | Digestive Tolerance | Best Use |
|---|---|---|---|
| Bisglycinate | Very high | Excellent | Daily, rest, muscles |
| Malate | High | Good | Energy, muscles, daytime |
| Taurate | High | Good | Cardiovascular, nervous system |
| Citrate | Medium-high | Variable (may be laxative) | Intestinal transit |
| Threonate | High | Good | Cognitive, focus |
| Oxide | Low (~4%) | Fair | Economical, occasional |
Why formulas with several types of magnesium are increasingly used
A formula with a single type of magnesium covers a specific goal well, but limits others. Current formulations tend to combine several types to offer a more complete profile: optimal absorption, good tolerance, and versatile approach.
In our TriMagnesio formula, we combine magnesium bisglycinate, malate, and taurate, in addition to vitamin B6, which contributes to normal protein and energy metabolism. It is the formula we recommend for those looking for versatile magnesium, easy to maintain over time, with a triple focus: rest, energy, and nervous system.
When to take magnesium
The ideal time depends on the goal:
- In the morning if you are looking for energy, focus, and muscle function during the day.
- At night if you use it for relaxation, rest, or post-workout muscle recovery.
- At any time if your priority is to maintain a constant supply.
We detail this in this article: When to take magnesium: morning or night depending on what you're looking for.
How to choose a good magnesium supplement
Before buying, pay attention to:
- Actual elemental magnesium, not total salt weight. A supplement may advertise "1,000 mg of bisglycinate" but only provide 100 mg of elemental magnesium.
- Type of magnesium clearly stated.
- Combination with vitamin B6, which improves mineral utilization.
- Absence of unnecessary excipients (titanium dioxide, excessive vegetable stearates, sweeteners).
- Traceability and manufacturing under quality standards (ISO 22000, GMP).
Does taking magnesium have contraindications?
Magnesium is safe at recommended doses. People with severe kidney failure should consult their doctor before taking it. At very high doses (more than 350 mg/day of added elemental magnesium via supplementation, according to EFSA), a laxative effect may occur. If you are taking other medications (especially antibiotics, diuretics, or bisphosphonates), space out the intake by at least 2 hours.
Conclusion
Magnesium is not just any nutrient: it is a central piece of the body's functioning, present in energy, muscle, sleep, and nervous balance. The key is not to look for "the best magnesium," but to choose the one that best fits your goal and maintain it over time.
If you want a formula designed for daily use, with triple magnesium and vitamin B6, discover TriMagnesio.
And if you have questions about which one is best for you, you can take our test or contact us via WhatsApp: our doctors will answer you free of charge.
Frequently asked questions about magnesium
What is the best magnesium for sleep?
Magnesium bisglycinate is the form with the best profile for promoting rest, due to its tolerance and its calming effect through glycine.
How much magnesium can be taken per day?
The recommended intake for adults is 300-420 mg/day. The EFSA sets a limit of 250 mg/day of added elemental magnesium via supplements, beyond diet.
Does magnesium make you gain or lose weight?
Neither. Magnesium does not provide calories nor does it directly affect body weight.
How long does it take for magnesium to take effect?
Some sensations (muscle relaxation, fewer cramps) may be noticed in a few days. Others (sleep, recovery of cellular levels) require 2 to 4 weeks of consistent intake.
Can I take magnesium with melatonin?
Yes, they are compatible and complementary. Melatonin helps initiate sleep and magnesium promotes prior relaxation. We explain it here: Melatonin or magnesium for sleep.
Is magnesium powder or capsules better?
The difference is more in the formulation than in the format. What is important is the type of magnesium, the dose of elemental magnesium, and the quality of the excipients.
Bibliographic references
- De Baaij JH, Hoenderop JG, Bindels RJ. Magnesium in man: implications for health and disease. Physiol Rev. 2015;95(1):1-46.
- Veronese N et al. Magnesium and health outcomes: an umbrella review. Eur J Nutr. 2020;59(1):263-272.
- Al Alawi AM, Majoni SW, Falhammar H. Magnesium and Human Health: Perspectives and Research Directions. Int J Endocrinol. 2018:9041694.
- Touyz RM, de Baaij JHF, Hoenderop JGJ. Magnesium disorders. N Engl J Med. 2024;390(21):1998-2009.
- EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific Opinion on the substantiation of health claims related to magnesium. EFSA Journal 2010;8(10):1807.
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