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Best Magnesium Supplement: Glycinate, Citrate, Malate and L-Threonate Explained

Why magnesium isn’t just magnesium – and which form fits sleep, stress, energy, muscles, or digestion.

58 Min.Episode 5
Cover of the episode "Best Magnesium Supplement: Glycinate, Citrate, Malate and L-Threonate Explained"

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Summary

The episode at a glance

This summary was generated automatically by AI from the episode transcript and translated into English. It may contain errors or omissions and does not replace medical advice.

In this episode, Mario and Max explain the differences between various forms of magnesium. They discuss why not all magnesium compounds have the same effects and which forms are suited to specific goals such as sleep, stress, energy, or digestion. They also explain the importance of elemental magnesium content and the role of the substance magnesium is bound to (e.g., glycinate, citrate, threonate).

Key Takeaways

  • 01An adult's body contains about 20 grams of magnesium, most of it in the bones (around 60%) and muscles (around 30%). The daily requirement is about 300 mg of elemental magnesium.
  • 02Magnesium's effectiveness depends heavily on the substance it is bound to. This affects not only bioavailability but often also has physiological effects of its own.
  • 03Symptoms of magnesium deficiency are often nonspecific and can range from fatigue and exhaustion to restlessness, irritability, and sleep problems. A true deficiency is rare, but suboptimal intake is more common.
  • 04A whole-blood analysis is more informative for assessing magnesium status than a standard serum test, because very little magnesium circulates freely in blood serum.
  • 05Magnesium bisglycinate and magnesium L-threonate are considered particularly beneficial for the nervous system, relaxation, and sleep. They can cross the blood-brain barrier, although the evidence for this is stronger for threonate.
  • 06Magnesium malate is suitable for energy, mitochondria, and muscles because malate is part of the citric acid cycle. Because of its energizing effect, it is best taken in the morning.
  • 07At around 60%, magnesium oxide has the highest proportion of elemental magnesium, but very low bioavailability, and it can have a laxative effect at higher doses.
  • 08Magnesium citrate is a good all-rounder with relatively good bioavailability, but it can also affect digestion in some people.

In detail

Mario and Max begin by noting that magnesium is sold under the same name in many pharmacologically different compounds. The body contains around 20 g of magnesium, primarily in bones and muscles. A daily requirement of around 300 mg highlights the importance of regular intake. Magnesium is involved in over 600 enzymatic reactions and is essential for energy metabolism (ATP), nervous system function, muscle function, and bone health.

A mild deficiency causes nonspecific symptoms such as fatigue, restlessness, irritability, and sleep disturbances. A severe deficiency, which can lead to numbness, is very rare. Situations such as heavy sweating (exercise), stress, or alcohol consumption increase magnesium use. To assess magnesium status, whole-blood testing is preferable to serum testing because it provides a more accurate picture of cellular magnesium levels.

The hosts discuss various magnesium salts. Magnesium bisglycinate (bound to the amino acid glycine) and magnesium L-threonate (bound to threonic acid) are particularly suitable for sleep and stress because they can cross the blood-brain barrier. Magnesium malate (bound to malic acid) is involved in energy metabolism and is therefore a good choice for boosting energy, but should be taken in the morning. Magnesium taurate (with taurine) supports cardiovascular health.

Magnesium citrate has good bioavailability and is considered a good all-rounder, but it can cause digestive issues. Although magnesium oxide has the highest proportion of elemental magnesium, it is very poorly absorbed and therefore often has a laxative effect. It is frequently used in inexpensive supplements and combination products to increase the declared magnesium content.

Magnesium complexes combine several forms of magnesium to use different absorption pathways in the gut and ensure a broad supply. Mario and Max advise checking the proportion of inexpensive magnesium oxide in these complexes. Energizing forms (malate, citrate) should be taken in the morning, while calming forms (bisglycinate, threonate) should be taken in the evening. It is also important to leave a time gap between taking magnesium and taking thyroid hormones or certain antibiotics.

What you can actually do

  • When choosing magnesium products, check the amount of elemental magnesium, not just the total weight of the magnesium compound.
  • Choose the form of magnesium that suits your individual goal: bisglycinate or L-threonate for sleep and relaxation, malate for energy (in the morning), taurate for cardiovascular health, and citrate as a general all-rounder.
  • If you have a sensitive stomach, magnesium bisglycinate is often the best-tolerated form. Avoid high-dose magnesium oxide unless you want a laxative effect.
  • If you take thyroid hormones (e.g., L-Thyroxin), leave several hours between taking them and taking magnesium so that you do not impair hormone absorption.
  • For better absorption, spread your magnesium intake throughout the day, for example in the morning and evening, rather than taking a single large dose.

Mentioned in this episode

Magnesium bisglycinate
Bound to two glycine molecules. Considered very well tolerated and, thanks to glycine's calming effect, particularly suitable for sleep, relaxation, and stress.
Magnesium L-threonate
Bound to threonic acid (a vitamin C derivative). Considered the form with the strongest evidence for crossing the blood-brain barrier most effectively. Recommended for stress and cognitive function, but very expensive.
Magnesium malate
Bound to malic acid (malate). Because malate plays a role in the citric acid cycle, this form has an energizing effect and supports energy metabolism and muscle function. Should be taken in the morning.
Magnesium citrate
Bound to the salts of citric acid. A good all-rounder with good bioavailability, although it can have a laxative effect in sensitive individuals.
Magnesium oxide
Has a high proportion of elemental magnesium (around 60%), but very poor bioavailability. It therefore often has a laxative effect and is used in inexpensive supplements or to increase the declared total magnesium content of magnesium complexes.
Magnesium taurate
Bound to taurine. The combination with taurine particularly supports cardiovascular health and blood pressure.
Magnesium orotate
Bound to orotic acid. Studies have shown positive effects on cardiac performance, but it is not approved as a dietary supplement in the EU.

What this episode is about

Magnesium oxide, citrate, bisglycinate, malate, taurate or L-threonate—which form should you choose? We compare absorption, tolerance and uses, and explain how to read the elemental magnesium amount on the label.

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